def test_ioclass_file_offset(prepare_and_cleanup):
cache, core = prepare()
ioclass_id = 1
iterations = 100
dd_size = Size(4, Unit.KibiByte)
dd_count = 1
min_cached_offset = 16384
max_cached_offset = 65536
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=
f"file_offset:gt:{min_cached_offset}&file_offset:lt:{max_cached_offset}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
TestProperties.LOGGER.info(
f"Preparing filesystem and mounting {core.system_path} at {mountpoint}"
)
core.create_filesystem(Filesystem.ext3)
core.mount(mountpoint)
cache.flush_cache()
# Since ioclass rule consists of strict inequalities, 'seek' can't be set to first
# nor last sector
min_seek = int(
(min_cached_offset + Unit.Blocks4096.value) / Unit.Blocks4096.value)
max_seek = int(
(max_cached_offset - min_cached_offset - Unit.Blocks4096.value) /
Unit.Blocks4096.value)
TestProperties.LOGGER.info(f"Writing to file within cached offset range")
for i in range(iterations):
file_offset = random.choice(range(min_seek, max_seek))
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/tmp_file").count(
dd_count).block_size(dd_size).seek(file_offset))
dd.run()
sync()
stats = cache.get_cache_statistics(io_class_id=ioclass_id)
assert (stats["dirty"].get_value(
Unit.Blocks4096) == 1), f"Offset not cached: {file_offset}"
cache.flush_cache()
min_seek = 0
max_seek = int(min_cached_offset / Unit.Blocks4096.value)
TestProperties.LOGGER.info(
f"Writing to file outside of cached offset range")
for i in range(iterations):
file_offset = random.choice(range(min_seek, max_seek))
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/tmp_file").count(
dd_count).block_size(dd_size).seek(file_offset))
dd.run()
sync()
stats = cache.get_cache_statistics(io_class_id=ioclass_id)
assert (stats["dirty"].get_value(Unit.Blocks4096) == 0
), f"Inappropriately cached offset: {file_offset}"
def test_ioclass_lba(prepare_and_cleanup):
"""Write data to random lba and check if it is cached according to range
defined in ioclass rule"""
cache, core = prepare()
ioclass_id = 1
min_cached_lba = 56
max_cached_lba = 200
iterations = 100
dd_size = Size(1, Unit.Blocks512)
dd_count = 1
# Prepare ioclass config
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"lba:ge:{min_cached_lba}&lba:le:{max_cached_lba}&done",
ioclass_config_path=ioclass_config_path,
)
# Prepare cache for test
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
cache.flush_cache()
# Check if lbas from defined range are cached
dirty_count = 0
# '8' step is set to prevent writting cache line more than once
TestProperties.LOGGER.info(
f"Writing to one sector in each cache line from range.")
for lba in range(min_cached_lba, max_cached_lba, 8):
dd = (Dd().input("/dev/zero").output(f"{core.system_path}").count(
dd_count).block_size(dd_size).seek(lba))
dd.run()
sync()
dirty_count += 1
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert (stats["dirty"].get_value(
Unit.Blocks4096) == dirty_count), f"LBA {lba} not cached"
cache.flush_cache()
# Check if lba outside of defined range are not cached
TestProperties.LOGGER.info(
f"Writing to random sectors outside of cached range.")
for i in range(iterations):
rand_lba = random.randrange(2000)
if min_cached_lba <= rand_lba <= max_cached_lba:
continue
dd = (Dd().input("/dev/zero").output(f"{core.system_path}").count(
dd_count).block_size(dd_size).seek(rand_lba))
dd.run()
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert (stats["dirty"].get_value(
Unit.Blocks4096) == 0), f"Inappropriately cached lba: {rand_lba}"
def test_ioclass_stats_set(prepare_and_cleanup):
"""Try to retrieve stats for all set ioclasses"""
prepare()
min_ioclass_id = 1
max_ioclass_id = 11
ioclass_config.create_ioclass_config(
add_default_rule=True, ioclass_config_path=ioclass_config_path
)
TestProperties.LOGGER.info("Preparing ioclass config file")
for i in range(min_ioclass_id, max_ioclass_id):
ioclass_config.add_ioclass(
ioclass_id=(i + 10),
eviction_priority=22,
allocation=True,
rule=f"file_size:le:{4096*i}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id, file=ioclass_config_path)
TestProperties.LOGGER.info("Preparing ioclass config file")
for i in range(32):
if i != 0 or i not in range(min_ioclass_id, max_ioclass_id):
with pytest.raises(Exception):
assert casadm_parser.get_statistics(
cache_id=cache_id, io_class_id=True, filter=[StatsFilter.conf]
)
def test_ioclass_process_name(prepare_and_cleanup):
"""Check if data generated by process with particular name is cached"""
cache, core = prepare()
ioclass_id = 1
dd_size = Size(4, Unit.KibiByte)
dd_count = 1
iterations = 100
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"process_name:dd&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
cache.flush_cache()
Udev.disable()
TestProperties.LOGGER.info(
f"Check if all data generated by dd process is cached.")
for i in range(iterations):
dd = (Dd().input("/dev/zero").output(
core.system_path).count(dd_count).block_size(dd_size).seek(i))
dd.run()
sync()
time.sleep(0.1)
stats = cache.get_cache_statistics(io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == (i + 1) * dd_count
def test_ioclass_conditions_and(filesystem):
"""
title: IO class condition 'and'.
description: |
Load config with IO class combining 5 conditions contradicting
at least one other condition.
pass_criteria:
- No kernel bug.
- Every IO fulfilling one of the conditions is not classified.
"""
file_size = Size(random.randint(25, 50), Unit.MebiByte)
file_size_bytes = int(file_size.get_value(Unit.Byte))
with TestRun.step("Prepare cache and core. Disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Create and load IO class config file."):
# directories OR condition
ioclass_config.add_ioclass(
ioclass_id=1,
eviction_priority=1,
allocation=True,
rule=
f"file_size:gt:{file_size_bytes}&file_size:lt:{file_size_bytes}&"
f"file_size:ge:{file_size_bytes}&file_size:le:{file_size_bytes}&"
f"file_size:eq:{file_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
TestRun.LOGGER.info(f"Preparing {filesystem.name} filesystem "
f"and mounting {core.system_path} at {mountpoint}")
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
base_occupancy = cache.get_io_class_statistics(
io_class_id=1).usage_stats.occupancy
# Perform IO
for size in [
file_size, file_size + Size(1, Unit.MebiByte),
file_size - Size(1, Unit.MebiByte)
]:
(Fio().create_command().io_engine(
IoEngine.libaio).size(size).read_write(
ReadWrite.write).target(f"{mountpoint}/test_file").run())
sync()
new_occupancy = cache.get_io_class_statistics(
io_class_id=1).usage_stats.occupancy
if new_occupancy != base_occupancy:
TestRun.fail(
"Unexpected occupancy increase!\n"
f"Expected: {base_occupancy}, actual: {new_occupancy}")
def test_ioclass_conditions_or(filesystem):
"""
title: IO class condition 'or'.
description: |
Load config with IO class combining 5 contradicting conditions connected by OR operator.
pass_criteria:
- No kernel bug.
- Every IO fulfilling one condition is classified properly.
"""
with TestRun.step("Prepare cache and core. Disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Create and load IO class config file."):
# directories OR condition
ioclass_config.add_ioclass(
ioclass_id=1,
eviction_priority=1,
allocation=True,
rule=
f"directory:{mountpoint}/dir1|directory:{mountpoint}/dir2|directory:"
f"{mountpoint}/dir3|directory:{mountpoint}/dir4|directory:{mountpoint}/dir5",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(f"Prepare {filesystem.name} filesystem "
f"and mount {core.system_path} at {mountpoint}."):
core.create_filesystem(filesystem)
core.mount(mountpoint)
for i in range(1, 6):
fs_utils.create_directory(f"{mountpoint}/dir{i}")
sync()
with TestRun.step(
"Perform IO fulfilling each condition and check if occupancy raises."
):
for i in range(1, 6):
file_size = Size(random.randint(25, 50), Unit.MebiByte)
base_occupancy = cache.get_io_class_statistics(
io_class_id=1).usage_stats.occupancy
(Fio().create_command().io_engine(
IoEngine.libaio).size(file_size).read_write(
ReadWrite.write).target(
f"{mountpoint}/dir{i}/test_file").run())
sync()
new_occupancy = cache.get_io_class_statistics(
io_class_id=1).usage_stats.occupancy
if new_occupancy != base_occupancy + file_size:
TestRun.fail(
"Occupancy has not increased correctly!\n"
f"Expected: {base_occupancy + file_size}, actual: {new_occupancy}"
)
def test_ioclass_stats_basic(random_cls):
"""
title: Basic test for retrieving IO class statistics.
description: |
Check if statistics are retrieved only for configured IO classes.
pass_criteria:
- Statistics are retrieved for configured IO classes.
- Error is displayed when retrieving statistics for non-configured IO class.
- Error is displayed when retrieving statistics for out of range IO class id.
"""
min_ioclass_id = 11
max_ioclass_id = 21
with TestRun.step("Test prepare"):
prepare(random_cls)
with TestRun.step("Prepare IO class config file"):
ioclass_list = []
for class_id in range(min_ioclass_id, max_ioclass_id):
ioclass_list.append(IoClass(
class_id=class_id,
rule=f"file_size:le:{4096 * class_id}&done",
priority=22
))
IoClass.save_list_to_config_file(ioclass_list, True)
with TestRun.step("Load IO class config file"):
casadm.load_io_classes(cache_id, file=ioclass_config.default_config_file_path)
with TestRun.step("Try retrieving IO class stats for all allowed id values "
"and one out of range id"):
for class_id in range(ioclass_config.MAX_IO_CLASS_ID + 2):
out_of_range = " out of range" if class_id > ioclass_config.MAX_IO_CLASS_ID else ""
with TestRun.group(f"Checking{out_of_range} IO class id {class_id}..."):
expected = class_id == 0 or class_id in range(min_ioclass_id, max_ioclass_id)
try:
casadm.print_statistics(
cache_id=cache_id,
io_class_id=class_id,
per_io_class=True)
if not expected:
TestRun.LOGGER.error(
f"Stats retrieved for not configured IO class {class_id}")
except CmdException as e:
if expected:
TestRun.LOGGER.error(f"Stats not retrieved for IO class id: {class_id}")
elif class_id <= ioclass_config.MAX_IO_CLASS_ID:
if not check_stderr_msg(e.output, get_stats_ioclass_id_not_configured):
TestRun.LOGGER.error(
f"Wrong message for unused IO class id: {class_id}")
elif not check_stderr_msg(e.output, get_stats_ioclass_id_out_of_range):
TestRun.LOGGER.error(
f"Wrong message for out of range IO class id: {class_id}")
def test_ioclass_pid(prepare_and_cleanup):
cache, core = prepare()
ioclass_id = 1
iterations = 20
dd_count = 100
dd_size = Size(4, Unit.KibiByte)
Udev.disable()
# Since 'dd' has to be executed right after writing pid to 'ns_last_pid',
# 'dd' command is created and is appended to 'echo' command instead of running it
dd_command = str(Dd().input("/dev/zero").output(
core.system_path).count(dd_count).block_size(dd_size))
for i in range(iterations):
cache.flush_cache()
output = TestProperties.executor.execute(
"cat /proc/sys/kernel/ns_last_pid")
if output.exit_code != 0:
raise Exception(
f"Failed to retrieve pid. stdout: {output.stdout} \n stderr :{output.stderr}"
)
# Few pids might be used by system during test preparation
pid = int(output.stdout) + 50
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"pid:eq:{pid}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
TestProperties.LOGGER.info(f"Running dd with pid {pid}")
# pid saved in 'ns_last_pid' has to be smaller by one than target dd pid
dd_and_pid_command = (
f"echo {pid-1} > /proc/sys/kernel/ns_last_pid && {dd_command}")
output = TestProperties.executor.execute(dd_and_pid_command)
if output.exit_code != 0:
raise Exception(
f"Failed to run dd with target pid. "
f"stdout: {output.stdout} \n stderr :{output.stderr}")
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == dd_count
ioclass_config.remove_ioclass(ioclass_id)
def test_ioclass_file_extension_preexisting_filesystem(prepare_and_cleanup):
"""Create files on filesystem, add device with filesystem as a core,
write data to files and check if they are cached properly"""
cache, core = prepare()
ioclass_id = 1
extensions = ["tmp", "tm", "out", "txt", "log", "123"]
dd_size = Size(4, Unit.KibiByte)
dd_count = 10
TestProperties.LOGGER.info(f"Preparing files on raw block device")
casadm.remove_core(cache.cache_id, core_id=core.core_id)
core.core_device.create_filesystem(Filesystem.ext3)
core.core_device.mount(mountpoint)
# Prepare files
for ext in extensions:
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}").
count(dd_count).block_size(dd_size))
dd.run()
core.core_device.unmount()
# Prepare ioclass config
rule = "|".join([f"extension:{ext}" for ext in extensions])
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"{rule}&done",
ioclass_config_path=ioclass_config_path,
)
# Prepare cache for test
TestProperties.LOGGER.info(
f"Adding device with preexisting data as a core")
core = casadm.add_core(cache, core_dev=core.core_device)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
core.mount(mountpoint)
cache.flush_cache()
# Check if files with proper extensions are cached
TestProperties.LOGGER.info(f"Writing to file with cached extension.")
for ext in extensions:
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}").
count(dd_count).block_size(dd_size))
dd.run()
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert (stats["dirty"].get_value(
Unit.Blocks4096) == (extensions.index(ext) + 1) * dd_count)
def test_ioclass_file_extension(prepare_and_cleanup):
cache, core = prepare()
iterations = 50
ioclass_id = 1
tested_extension = "tmp"
wrong_extensions = ["tm", "tmpx", "txt", "t", "", "123"]
dd_size = Size(4, Unit.KibiByte)
dd_count = 10
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"extension:{tested_extension}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
TestProperties.LOGGER.info(
f"Preparing filesystem and mounting {core.system_path} at {mountpoint}"
)
core.create_filesystem(Filesystem.ext3)
core.mount(mountpoint)
cache.flush_cache()
# Check if file with proper extension is cached
dd = (Dd().input("/dev/zero").output(
f"{mountpoint}/test_file.{tested_extension}").count(
dd_count).block_size(dd_size))
TestProperties.LOGGER.info(f"Writing to file with cached extension.")
for i in range(iterations):
dd.run()
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == (i + 1) * dd_count
cache.flush_cache()
# Check if file with improper extension is not cached
TestProperties.LOGGER.info(f"Writing to file with no cached extension.")
for ext in wrong_extensions:
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}").
count(dd_count).block_size(dd_size))
dd.run()
sync()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == 0
def test_ioclass_request_size(prepare_and_cleanup):
cache, core = prepare()
ioclass_id = 1
iterations = 100
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"request_size:ge:8192&request_size:le:16384&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
Udev.disable()
# Check if requests with appropriate size are cached
TestProperties.LOGGER.info(
f"Check if requests with size within defined range are cached")
cached_req_sizes = [Size(2, Unit.Blocks4096), Size(4, Unit.Blocks4096)]
for i in range(iterations):
cache.flush_cache()
req_size = random.choice(cached_req_sizes)
dd = (Dd().input("/dev/zero").output(
core.system_path).count(1).block_size(req_size).oflag("direct"))
dd.run()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert (stats["dirty"].get_value(Unit.Blocks4096) == req_size.value /
Unit.Blocks4096.value)
cache.flush_cache()
# Check if requests with inappropriate size are not cached
TestProperties.LOGGER.info(
f"Check if requests with size outside defined range are not cached")
not_cached_req_sizes = [
Size(1, Unit.Blocks4096),
Size(8, Unit.Blocks4096),
Size(16, Unit.Blocks4096),
]
for i in range(iterations):
req_size = random.choice(not_cached_req_sizes)
dd = (Dd().input("/dev/zero").output(
core.system_path).count(1).block_size(req_size).oflag("direct"))
dd.run()
stats = cache.get_cache_statistics(per_io_class=True,
io_class_id=ioclass_id)
assert stats["dirty"].get_value(Unit.Blocks4096) == 0
def load_io_classes_in_permutation_order(rules, permutation, cache):
ioclass_config.remove_ioclass_config(ioclass_config_path=ioclass_config_path)
ioclass_config.create_ioclass_config(
add_default_rule=False, ioclass_config_path=ioclass_config_path
)
# To make test more precise all workload except of tested ioclass should be
# put in pass-through mode
ioclass_list = [IoClass.default(allocation=False)]
for n in range(len(rules)):
ioclass_list.append(IoClass(class_id=permutation[n], rule=rules[n]))
IoClass.save_list_to_config_file(ioclass_list,
add_default_rule=False,
ioclass_config_path=ioclass_config_path)
casadm.load_io_classes(cache.cache_id, file=ioclass_config_path)
def add_done_to_second_non_exclusive_condition(rules, permutation, cache):
non_exclusive_conditions = 0
second_class_id = 1
while True:
idx = permutation.index(second_class_id)
if rules[idx] != "direct":
non_exclusive_conditions += 1
if non_exclusive_conditions == 2:
break
second_class_id += 1
fs_utils.replace_first_pattern_occurrence(ioclass_config_path,
rules[idx], f"{rules[idx]}&done")
sync()
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
return second_class_id
def load_file_size_io_classes(cache, base_size):
# IO class order intentional, do not change
base_size_bytes = int(base_size.get_value(Unit.Byte))
ioclass_config.add_ioclass(
ioclass_id=6,
eviction_priority=1,
allocation="0.00",
rule=f"metadata",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=1,
eviction_priority=1,
allocation="1.00",
rule=f"file_size:eq:{base_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=2,
eviction_priority=1,
allocation="1.00",
rule=f"file_size:lt:{base_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=3,
eviction_priority=1,
allocation="1.00",
rule=f"file_size:gt:{base_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=4,
eviction_priority=1,
allocation="1.00",
rule=f"file_size:le:{int(base_size_bytes / 2)}",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=5,
eviction_priority=1,
allocation="1.00",
rule=f"file_size:ge:{2 * base_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
def test_ioclass_process_name():
"""
title: Test IO classification by process name.
description: Check if data generated by process with particular name is cached.
pass_criteria:
- No kernel bug.
- IO is classified properly based on process generating IO name.
"""
ioclass_id = 1
dd_size = Size(4, Unit.KibiByte)
dd_count = 1
iterations = 100
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Create and load IO class config file."):
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"process_name:dd&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step("Flush cache and disable udev."):
cache.flush_cache()
Udev.disable()
with TestRun.step("Check if all data generated by dd process is cached."):
for i in range(iterations):
dd = (
Dd()
.input("/dev/zero")
.output(core.path)
.count(dd_count)
.block_size(dd_size)
.seek(i)
)
dd.run()
sync()
time.sleep(0.1)
dirty = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != (i + 1) * dd_count:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
def test_ioclass_id_as_condition(filesystem):
"""
title: IO class as a condition.
description: |
Load config in which IO class ids are used as conditions in other IO class definitions.
pass_criteria:
- No kernel bug.
- IO is classified properly as described in IO class config.
"""
base_dir_path = f"{mountpoint}/base_dir"
ioclass_file_size = Size(random.randint(25, 50), Unit.MebiByte)
ioclass_file_size_bytes = int(ioclass_file_size.get_value(Unit.Byte))
with TestRun.step("Prepare cache and core. Disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Create and load IO class config file."):
# directory condition
ioclass_config.add_ioclass(
ioclass_id=1,
eviction_priority=1,
allocation=True,
rule=f"directory:{base_dir_path}",
ioclass_config_path=ioclass_config_path,
)
# file size condition
ioclass_config.add_ioclass(
ioclass_id=2,
eviction_priority=1,
allocation=True,
rule=f"file_size:eq:{ioclass_file_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
# direct condition
ioclass_config.add_ioclass(
ioclass_id=3,
eviction_priority=1,
allocation=True,
rule="direct",
ioclass_config_path=ioclass_config_path,
)
# IO class 1 OR 2 condition
ioclass_config.add_ioclass(
ioclass_id=4,
eviction_priority=1,
allocation=True,
rule="io_class:1|io_class:2",
ioclass_config_path=ioclass_config_path,
)
# IO class 4 AND file size condition (same as IO class 2)
ioclass_config.add_ioclass(
ioclass_id=5,
eviction_priority=1,
allocation=True,
rule=f"io_class:4&file_size:eq:{ioclass_file_size_bytes}",
ioclass_config_path=ioclass_config_path,
)
# IO class 3 condition
ioclass_config.add_ioclass(
ioclass_id=6,
eviction_priority=1,
allocation=True,
rule="io_class:3",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step(f"Prepare {filesystem.name} filesystem "
f"and mount {core.path} at {mountpoint}."):
core.create_filesystem(filesystem)
core.mount(mountpoint)
fs_utils.create_directory(base_dir_path)
sync()
with TestRun.step("Run IO fulfilling IO class 1 condition (and not IO class 2) and check if "
"it is classified properly."):
# Should be classified as IO class 4
base_occupancy = cache.get_io_class_statistics(io_class_id=4).usage_stats.occupancy
non_ioclass_file_size = Size(random.randrange(1, 25), Unit.MebiByte)
(Fio().create_command()
.io_engine(IoEngine.libaio)
.size(non_ioclass_file_size)
.read_write(ReadWrite.write)
.target(f"{base_dir_path}/test_file_1")
.run())
sync()
new_occupancy = cache.get_io_class_statistics(io_class_id=4).usage_stats.occupancy
if new_occupancy != base_occupancy + non_ioclass_file_size:
TestRun.fail("Writes were not properly cached!\n"
f"Expected: {base_occupancy + non_ioclass_file_size}, "
f"actual: {new_occupancy}")
with TestRun.step("Run IO fulfilling IO class 2 condition (and not IO class 1) and check if "
"it is classified properly."):
# Should be classified as IO class 5
base_occupancy = cache.get_io_class_statistics(io_class_id=5).usage_stats.occupancy
(Fio().create_command()
.io_engine(IoEngine.libaio)
.size(ioclass_file_size)
.read_write(ReadWrite.write)
.target(f"{mountpoint}/test_file_2")
.run())
sync()
new_occupancy = cache.get_io_class_statistics(io_class_id=5).usage_stats.occupancy
if new_occupancy != base_occupancy + ioclass_file_size:
TestRun.fail("Writes were not properly cached!\n"
f"Expected: {base_occupancy + ioclass_file_size}, actual: {new_occupancy}")
with TestRun.step("Run IO fulfilling IO class 1 and 2 conditions and check if "
"it is classified properly."):
# Should be classified as IO class 5
base_occupancy = new_occupancy
(Fio().create_command()
.io_engine(IoEngine.libaio)
.size(ioclass_file_size)
.read_write(ReadWrite.write)
.target(f"{base_dir_path}/test_file_3")
.run())
sync()
new_occupancy = cache.get_io_class_statistics(io_class_id=5).usage_stats.occupancy
if new_occupancy != base_occupancy + ioclass_file_size:
TestRun.fail("Writes were not properly cached!\n"
f"Expected: {base_occupancy + ioclass_file_size}, actual: {new_occupancy}")
with TestRun.step("Run direct IO fulfilling IO class 1 and 2 conditions and check if "
"it is classified properly."):
# Should be classified as IO class 6
base_occupancy = cache.get_io_class_statistics(io_class_id=6).usage_stats.occupancy
(Fio().create_command()
.io_engine(IoEngine.libaio)
.size(ioclass_file_size)
.read_write(ReadWrite.write)
.target(f"{base_dir_path}/test_file_3")
.direct()
.run())
sync()
new_occupancy = cache.get_io_class_statistics(io_class_id=6).usage_stats.occupancy
if new_occupancy != base_occupancy + ioclass_file_size:
TestRun.fail("Writes were not properly cached!\n"
f"Expected: {base_occupancy + ioclass_file_size}, actual: {new_occupancy}")
def test_ioclass_metadata(filesystem):
"""
title: Metadata IO classification.
description: |
Determine if every operation on files that cause metadata update results in increased
writes to cached metadata.
pass_criteria:
- No kernel bug.
- Metadata is classified properly.
"""
# Exact values may not be tested as each file system has different metadata structure.
test_dir_path = f"{mountpoint}/test_dir"
with TestRun.step("Prepare cache and core. Disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Prepare and load IO class config file."):
ioclass_id = random.randint(1, ioclass_config.MAX_IO_CLASS_ID)
# metadata IO class
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule="metadata&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step(f"Prepare {filesystem.name} filesystem and mount {core.path} "
f"at {mountpoint}."):
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
with TestRun.step("Create 20 test files."):
requests_to_metadata_before = cache.get_io_class_statistics(
io_class_id=ioclass_id).request_stats.write
files = []
for i in range(1, 21):
file_path = f"{mountpoint}/test_file_{i}"
dd = (
Dd().input("/dev/urandom")
.output(file_path)
.count(random.randint(5, 50))
.block_size(Size(1, Unit.MebiByte))
.oflag("sync")
)
dd.run()
files.append(File(file_path))
with TestRun.step("Check requests to metadata."):
requests_to_metadata_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).request_stats.write
if requests_to_metadata_after == requests_to_metadata_before:
TestRun.fail("No requests to metadata while creating files!")
with TestRun.step("Rename all test files."):
requests_to_metadata_before = requests_to_metadata_after
for file in files:
file.move(f"{file.full_path}_renamed")
sync()
with TestRun.step("Check requests to metadata."):
requests_to_metadata_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).request_stats.write
if requests_to_metadata_after == requests_to_metadata_before:
TestRun.fail("No requests to metadata while renaming files!")
with TestRun.step(f"Create directory {test_dir_path}."):
requests_to_metadata_before = requests_to_metadata_after
fs_utils.create_directory(path=test_dir_path)
TestRun.LOGGER.info(f"Moving test files into {test_dir_path}")
for file in files:
file.move(test_dir_path)
sync()
with TestRun.step("Check requests to metadata."):
requests_to_metadata_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).request_stats.write
if requests_to_metadata_after == requests_to_metadata_before:
TestRun.fail("No requests to metadata while moving files!")
with TestRun.step(f"Remove {test_dir_path}."):
fs_utils.remove(path=test_dir_path, force=True, recursive=True)
with TestRun.step("Check requests to metadata."):
requests_to_metadata_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).request_stats.write
if requests_to_metadata_after == requests_to_metadata_before:
TestRun.fail("No requests to metadata while deleting directory with files!")
def test_ioclass_lba():
"""
title: Test IO classification by lba.
description: |
Write data to random lba and check if it is cached according to range
defined in ioclass rule
pass_criteria:
- No kernel bug.
- IO is classified properly based on lba range defined in config.
"""
ioclass_id = 1
min_cached_lba = 56
max_cached_lba = 200
iterations = 100
dd_size = Size(1, Unit.Blocks512)
dd_count = 1
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Prepare and load IO class config."):
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"lba:ge:{min_cached_lba}&lba:le:{max_cached_lba}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step("Run IO and check if lbas from defined range are cached."):
dirty_count = 0
# '8' step is set to prevent writing cache line more than once
TestRun.LOGGER.info(f"Writing to one sector in each cache line from range.")
for lba in range(min_cached_lba, max_cached_lba, 8):
dd = (
Dd().input("/dev/zero")
.output(f"{core.path}")
.count(dd_count)
.block_size(dd_size)
.seek(lba)
)
dd.run()
sync()
dirty_count += 1
dirty = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != dirty_count:
TestRun.LOGGER.error(f"LBA {lba} not cached")
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step("Run IO and check if lba outside of defined range are not cached."):
TestRun.LOGGER.info(f"Writing to random sectors outside of cached range.")
for i in range(iterations):
rand_lba = random.randrange(2000)
if min_cached_lba <= rand_lba <= max_cached_lba:
continue
dd = (
Dd().input("/dev/zero")
.output(f"{core.path}")
.count(dd_count)
.block_size(dd_size)
.seek(rand_lba)
)
dd.run()
sync()
dirty = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != 0:
TestRun.LOGGER.error(f"Inappropriately cached lba: {rand_lba}")
def test_ioclass_direct(filesystem):
"""
title: Direct IO classification.
description: Check if direct requests are properly cached.
pass_criteria:
- No kernel bug.
- Data from direct IO should be cached.
- Data from buffered IO should not be cached and if performed to/from already cached data
should cause reclassification to unclassified IO class.
"""
ioclass_id = 1
io_size = Size(random.randint(1000, 2000), Unit.Blocks4096)
with TestRun.step("Prepare cache and core. Disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Create and load IO class config."):
# direct IO class
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule="direct",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step("Prepare fio command."):
fio = Fio().create_command() \
.io_engine(IoEngine.libaio) \
.size(io_size).offset(io_size) \
.read_write(ReadWrite.write) \
.target(f"{mountpoint}/tmp_file" if filesystem else core.path)
with TestRun.step("Prepare filesystem."):
if filesystem:
TestRun.LOGGER.info(
f"Preparing {filesystem.name} filesystem and mounting {core.path} at"
f" {mountpoint}"
)
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
else:
TestRun.LOGGER.info("Testing on raw exported object.")
with TestRun.step(f"Run buffered writes to {'file' if filesystem else 'device'}"):
base_occupancy = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.occupancy
fio.run()
sync()
with TestRun.step("Check if buffered writes are not cached."):
new_occupancy = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.occupancy
if new_occupancy != base_occupancy:
TestRun.fail("Buffered writes were cached!\n"
f"Expected: {base_occupancy}, actual: {new_occupancy}")
with TestRun.step(f"Run direct writes to {'file' if filesystem else 'device'}"):
fio.direct()
fio.run()
sync()
with TestRun.step("Check if direct writes are cached."):
new_occupancy = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.occupancy
if new_occupancy != base_occupancy + io_size:
TestRun.fail("Wrong number of direct writes was cached!\n"
f"Expected: {base_occupancy + io_size}, actual: {new_occupancy}")
with TestRun.step(f"Run buffered reads from {'file' if filesystem else 'device'}"):
fio.remove_param("readwrite").remove_param("direct")
fio.read_write(ReadWrite.read)
fio.run()
sync()
with TestRun.step("Check if buffered reads caused reclassification."):
new_occupancy = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.occupancy
if new_occupancy != base_occupancy:
TestRun.fail("Buffered reads did not cause reclassification!"
f"Expected occupancy: {base_occupancy}, actual: {new_occupancy}")
with TestRun.step(f"Run direct reads from {'file' if filesystem else 'device'}"):
fio.direct()
fio.run()
sync()
with TestRun.step("Check if direct reads are cached."):
new_occupancy = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.occupancy
if new_occupancy != base_occupancy + io_size:
TestRun.fail("Wrong number of direct reads was cached!\n"
f"Expected: {base_occupancy + io_size}, actual: {new_occupancy}")
def test_ioclass_request_size():
"""
title: Test IO classification by request size.
description: Check if requests with size within defined range are cached.
pass_criteria:
- No kernel bug.
- IO is classified properly based on request size range defined in config.
"""
ioclass_id = 1
iterations = 100
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Create and load IO class config."):
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation=True,
rule=f"request_size:ge:8192&request_size:le:16384&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
with TestRun.step("Disable udev."):
Udev.disable()
with TestRun.step("Check if requests with size within defined range are cached."):
cached_req_sizes = [Size(2, Unit.Blocks4096), Size(4, Unit.Blocks4096)]
for i in range(iterations):
cache.flush_cache()
req_size = random.choice(cached_req_sizes)
dd = (
Dd().input("/dev/zero")
.output(core.path)
.count(1)
.block_size(req_size)
.oflag("direct")
)
dd.run()
dirty = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != req_size.value / Unit.Blocks4096.value:
TestRun.fail("Incorrect number of dirty blocks!")
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step("Check if requests with size outside of defined range are not cached"):
not_cached_req_sizes = [
Size(1, Unit.Blocks4096),
Size(8, Unit.Blocks4096),
Size(16, Unit.Blocks4096),
]
for i in range(iterations):
req_size = random.choice(not_cached_req_sizes)
dd = (
Dd().input("/dev/zero")
.output(core.path)
.count(1)
.block_size(req_size)
.oflag("direct")
)
dd.run()
dirty = cache.get_io_class_statistics(io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != 0:
TestRun.fail("Dirty data present!")
def test_ioclass_export_configuration(cache_mode):
"""
title: Export IO class configuration to a file
description: |
Test CAS ability to create a properly formatted file with current IO class configuration
pass_criteria:
- CAS default IO class configuration contains unclassified class only
- CAS properly imports previously exported configuration
"""
with TestRun.LOGGER.step(f"Test prepare"):
cache, core = prepare(cache_mode)
saved_config_path = "/tmp/opencas_saved.conf"
default_list = [IoClass.default()]
with TestRun.LOGGER.step(
f"Check IO class configuration (should contain only default class)"
):
csv = casadm.list_io_classes(cache.cache_id, OutputFormat.csv).stdout
if not IoClass.compare_ioclass_lists(IoClass.csv_to_list(csv),
default_list):
TestRun.LOGGER.error(
"Default configuration does not match expected\n"
f"Current:\n{csv}\n"
f"Expected:{IoClass.list_to_csv(default_list)}")
with TestRun.LOGGER.step(
"Create and load configuration file for 33 IO classes "
"with random names, allocation and priority values"):
random_list = IoClass.generate_random_ioclass_list(33)
IoClass.save_list_to_config_file(
random_list, ioclass_config_path=ioclass_config_path)
casadm.load_io_classes(cache.cache_id, ioclass_config_path)
with TestRun.LOGGER.step(
"Display and export IO class configuration - displayed configuration "
"should be the same as created"):
TestRun.executor.run(
f"{casadm.list_io_classes_cmd(str(cache.cache_id), OutputFormat.csv.name)}"
f" > {saved_config_path}")
csv = fs_utils.read_file(saved_config_path)
if not IoClass.compare_ioclass_lists(IoClass.csv_to_list(csv),
random_list):
TestRun.LOGGER.error(
"Exported configuration does not match expected\n"
f"Current:\n{csv}\n"
f"Expected:{IoClass.list_to_csv(random_list)}")
with TestRun.LOGGER.step("Stop Intel CAS"):
casadm.stop_cache(cache.cache_id)
with TestRun.LOGGER.step("Start cache and add core"):
cache = casadm.start_cache(cache.cache_device, force=True)
casadm.add_core(cache, core.core_device)
with TestRun.LOGGER.step(
"Check IO class configuration (should contain only default class)"
):
csv = casadm.list_io_classes(cache.cache_id, OutputFormat.csv).stdout
if not IoClass.compare_ioclass_lists(IoClass.csv_to_list(csv),
default_list):
TestRun.LOGGER.error(
"Default configuration does not match expected\n"
f"Current:\n{csv}\n"
f"Expected:{IoClass.list_to_csv(default_list)}")
with TestRun.LOGGER.step(
"Load exported configuration file for 33 IO classes"):
casadm.load_io_classes(cache.cache_id, saved_config_path)
with TestRun.LOGGER.step(
"Display IO class configuration - should be the same as created"):
csv = casadm.list_io_classes(cache.cache_id, OutputFormat.csv).stdout
if not IoClass.compare_ioclass_lists(IoClass.csv_to_list(csv),
random_list):
TestRun.LOGGER.error(
"Exported configuration does not match expected\n"
f"Current:\n{csv}\n"
f"Expected:{IoClass.list_to_csv(random_list)}")
with TestRun.LOGGER.step(f"Test cleanup"):
fs_utils.remove(saved_config_path)
def test_ioclass_file_offset():
"""
title: Test IO classification by file offset.
description: Test if file offset classification works properly.
pass_criteria:
- No kernel bug.
- IO is classified properly based on IO class rule with file offset.
"""
ioclass_id = 1
iterations = 100
dd_size = Size(4, Unit.KibiByte)
dd_count = 1
min_cached_offset = 16384
max_cached_offset = 65536
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Create and load IO class config file."):
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=
f"file_offset:gt:{min_cached_offset}&file_offset:lt:{max_cached_offset}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(
f"Prepare filesystem and mount {core.path} at {mountpoint}."):
core.create_filesystem(Filesystem.ext3)
core.mount(mountpoint)
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step(
"Write to file within cached offset range and check if it is cached."
):
# Since ioclass rule consists of strict inequalities, 'seek' can't be set to first
# nor last sector
min_seek = int((min_cached_offset + Unit.Blocks4096.value) /
Unit.Blocks4096.value)
max_seek = int(
(max_cached_offset - min_cached_offset - Unit.Blocks4096.value) /
Unit.Blocks4096.value)
for i in range(iterations):
file_offset = random.choice(range(min_seek, max_seek))
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/tmp_file").
count(dd_count).block_size(dd_size).seek(file_offset))
dd.run()
sync()
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != 1:
TestRun.LOGGER.error(f"Offset not cached: {file_offset}")
cache.flush_cache()
with TestRun.step(
"Write to file outside of cached offset range and check if it is not cached."
):
min_seek = 0
max_seek = int(min_cached_offset / Unit.Blocks4096.value)
TestRun.LOGGER.info(f"Writing to file outside of cached offset range")
for i in range(iterations):
file_offset = random.choice(range(min_seek, max_seek))
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/tmp_file").
count(dd_count).block_size(dd_size).seek(file_offset))
dd.run()
sync()
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != 0:
TestRun.LOGGER.error(
f"Inappropriately cached offset: {file_offset}")
def test_trim_eviction(cache_mode, cache_line_size, filesystem, cleaning):
"""
title: Test verifying if trim requests do not cause eviction on CAS device.
description: |
When trim requests enabled and files are being added and removed from CAS device,
there is no eviction (no reads from cache).
pass_criteria:
- Reads from cache device are the same before and after removing test file.
"""
mount_point = "/mnt"
test_file_path = os.path.join(mount_point, "test_file")
with TestRun.step("Prepare devices."):
cache_disk = TestRun.disks['cache']
cache_disk.create_partitions([Size(1, Unit.GibiByte)])
cache_dev = cache_disk.partitions[0]
core_disk = TestRun.disks['core']
core_disk.create_partitions([Size(1, Unit.GibiByte)])
core_dev = core_disk.partitions[0]
cache_block_size = disk_utils.get_block_size(cache_disk)
with TestRun.step("Start cache on device supporting trim and add core."):
cache = casadm.start_cache(cache_dev,
cache_mode,
cache_line_size,
force=True)
cache.set_cleaning_policy(cleaning)
Udev.disable()
core = cache.add_core(core_dev)
with TestRun.step("Create filesystem on CAS device and mount it."):
core.create_filesystem(filesystem)
core.mount(mount_point, ["discard"])
with TestRun.step("Create ioclass config."):
ioclass_config.create_ioclass_config()
ioclass_config.add_ioclass(ioclass_id=1,
eviction_priority=1,
allocation="0.00",
rule=f"metadata")
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config.default_config_file_path)
with TestRun.step("Create random file using ddrescue."):
test_file = create_file_with_ddrescue(core_dev, test_file_path)
os_utils.sync()
os_utils.drop_caches()
time.sleep(ioclass_config.MAX_CLASSIFICATION_DELAY.seconds)
with TestRun.step("Remove file and create a new one."):
cache_iostats_before = cache_dev.get_io_stats()
data_reads_before = cache.get_io_class_statistics(
io_class_id=0).block_stats.cache.reads
metadata_reads_before = cache.get_io_class_statistics(
io_class_id=1).block_stats.cache.reads
test_file.remove()
os_utils.sync()
os_utils.drop_caches()
create_file_with_ddrescue(core_dev, test_file_path)
os_utils.sync()
os_utils.drop_caches()
time.sleep(ioclass_config.MAX_CLASSIFICATION_DELAY.seconds)
with TestRun.step(
"Check using iostat that reads from cache did not occur."):
cache_iostats_after = cache_dev.get_io_stats()
data_reads_after = cache.get_io_class_statistics(
io_class_id=0).block_stats.cache.reads
metadata_reads_after = cache.get_io_class_statistics(
io_class_id=1).block_stats.cache.reads
reads_before = cache_iostats_before.sectors_read
reads_after = cache_iostats_after.sectors_read
metadata_reads_diff = metadata_reads_after - metadata_reads_before
data_reads_diff = data_reads_after - data_reads_before
iostat_diff = (reads_after - reads_before) * cache_block_size
if iostat_diff > int(metadata_reads_diff) or int(data_reads_diff) > 0:
TestRun.fail(
f"Number of reads from cache before and after removing test file "
f"differs. Sectors read before: {reads_before}, sectors read after: {reads_after}."
f"Data read from cache before {data_reads_before}, after {data_reads_after}."
f"Metadata read from cache before {metadata_reads_before}, "
f"after {metadata_reads_after}.")
else:
TestRun.LOGGER.info(
"Number of reads from cache before and after removing test file is the same."
)
def test_ioclass_occuppancy_load(cache_line_size):
"""
title: Load cache with occupancy limit specified
description: |
Load cache and verify if occupancy limits are loaded correctly and if
each part has assigned apropriate number of
dirty blocks.
pass_criteria:
- Occupancy thresholds have correct values for each ioclass after load
"""
with TestRun.step("Prepare CAS device"):
cache, core = prepare(cache_mode=CacheMode.WB,
cache_line_size=cache_line_size)
cache_size = cache.get_statistics().config_stats.cache_size
with TestRun.step("Disable udev"):
Udev.disable()
with TestRun.step(
f"Prepare filesystem and mount {core.path} at {mountpoint}"):
filesystem = Filesystem.xfs
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
with TestRun.step("Prepare test dirs"):
IoclassConfig = namedtuple("IoclassConfig",
"id eviction_prio max_occupancy dir_path")
io_classes = [
IoclassConfig(1, 3, 0.30, f"{mountpoint}/A"),
IoclassConfig(2, 3, 0.30, f"{mountpoint}/B"),
IoclassConfig(3, 3, 0.30, f"{mountpoint}/C"),
]
for io_class in io_classes:
fs_utils.create_directory(io_class.dir_path, parents=True)
with TestRun.step("Remove old ioclass config"):
ioclass_config.remove_ioclass_config()
ioclass_config.create_ioclass_config(False)
with TestRun.step("Add default ioclasses"):
ioclass_config.add_ioclass(*str(IoClass.default(
allocation="0.00")).split(","))
with TestRun.step("Add ioclasses for all dirs"):
for io_class in io_classes:
ioclass_config.add_ioclass(
io_class.id,
f"directory:{io_class.dir_path}&done",
io_class.eviction_prio,
f"{io_class.max_occupancy:0.2f}",
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step("Reset cache stats"):
cache.purge_cache()
cache.reset_counters()
with TestRun.step("Check initial occupancy"):
for io_class in io_classes:
occupancy = get_io_class_occupancy(cache, io_class.id)
if occupancy.get_value() != 0:
TestRun.LOGGER.error(
f"Incorrect inital occupancy for ioclass id: {io_class.id}."
f" Expected 0, got: {occupancy}")
with TestRun.step(f"Perform IO with size equal to cache size"):
for io_class in io_classes:
run_io_dir(f"{io_class.dir_path}/tmp_file",
int((cache_size) / Unit.Blocks4096))
with TestRun.step(
"Check if the ioclass did not exceed specified occupancy"):
for io_class in io_classes:
actuall_dirty = get_io_class_dirty(cache, io_class.id)
dirty_limit = ((io_class.max_occupancy * cache_size).align_down(
Unit.Blocks4096.get_value()).set_unit(Unit.Blocks4096))
if not isclose(actuall_dirty.get_value(),
dirty_limit.get_value(),
rel_tol=0.1):
TestRun.LOGGER.error(
f"Dirty for ioclass id: {io_class.id} doesn't match expected."
f"Expected: {dirty_limit}, actuall: {actuall_dirty}")
with TestRun.step("Stop cache without flushing the data"):
original_usage_stats = {}
for io_class in io_classes:
original_usage_stats[io_class.id] = get_io_class_usage(
cache, io_class.id)
original_ioclass_list = cache.list_io_classes()
cache_disk_path = cache.cache_device.path
core.unmount()
cache.stop(no_data_flush=True)
with TestRun.step("Load cache"):
cache = casadm.start_cache(Device(cache_disk_path), load=True)
with TestRun.step(
"Check if the ioclass did not exceed specified occupancy"):
for io_class in io_classes:
actuall_dirty = get_io_class_dirty(cache, io_class.id)
dirty_limit = ((io_class.max_occupancy * cache_size).align_down(
Unit.Blocks4096.get_value()).set_unit(Unit.Blocks4096))
if not isclose(actuall_dirty.get_value(),
dirty_limit.get_value(),
rel_tol=0.1):
TestRun.LOGGER.error(
f"Dirty for ioclass id: {io_class.id} doesn't match expected."
f"Expected: {dirty_limit}, actuall: {actuall_dirty}")
with TestRun.step("Compare ioclass configs"):
ioclass_list_after_load = cache.list_io_classes()
if len(ioclass_list_after_load) != len(original_ioclass_list):
TestRun.LOGGER.error(
f"Ioclass occupancy limit doesn't match. Original list size: "
f"{len(original_ioclass_list)}, loaded list size: "
f"{len(ioclass_list_after_load)}")
original_sorted = sorted(original_ioclass_list, key=lambda k: k["id"])
loaded_sorted = sorted(ioclass_list_after_load, key=lambda k: k["id"])
for original, loaded in zip(original_sorted, loaded_sorted):
original_allocation = original["allocation"]
loaded_allocation = loaded["allocation"]
ioclass_id = original["id"]
if original_allocation != loaded_allocation:
TestRun.LOGGER.error(
f"Occupancy limit doesn't match for ioclass {ioclass_id}: "
f"Original: {original_allocation}, loaded: {loaded_allocation}"
)
with TestRun.step("Compare usage stats before and after the load"):
for io_class in io_classes:
actuall_usage_stats = get_io_class_usage(cache, io_class.id)
if original_usage_stats[io_class.id] != actuall_usage_stats:
TestRun.LOGGER.error(
f"Usage stats doesn't match for ioclass {io_class.id}. "
f"Original: {original_usage_stats[io_class.id]}, "
f"loaded: {actuall_usage_stats}")
def test_ioclass_file_extension_preexisting_filesystem():
"""
title: Test IO classification by file extension with preexisting filesystem on core device.
description: |
Test if file extension classification works properly when there is an existing
filesystem on core device.
pass_criteria:
- No kernel bug.
- IO is classified properly based on IO class rule with file extension
after mounting core device.
"""
ioclass_id = 1
extensions = ["tmp", "tm", "out", "txt", "log", "123"]
dd_size = Size(4, Unit.KibiByte)
dd_count = 10
with TestRun.step("Prepare cache and core devices."):
cache, core = prepare()
with TestRun.step(f"Prepare files on raw block device."):
casadm.remove_core(cache.cache_id, core_id=core.core_id)
core.core_device.create_filesystem(Filesystem.ext3)
core.core_device.mount(mountpoint)
for ext in extensions:
dd = (
Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}")
.count(dd_count).block_size(dd_size))
dd.run()
core.core_device.unmount()
with TestRun.step("Create IO class config."):
rule = "|".join([f"extension:{ext}" for ext in extensions])
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"{rule}&done",
ioclass_config_path=ioclass_config_path,
)
with TestRun.step(f"Add device with preexisting data as a core."):
core = casadm.add_core(cache, core_dev=core.core_device)
with TestRun.step("Load IO class config."):
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step("Mount core and flush cache."):
core.mount(mountpoint)
cache.flush_cache()
with TestRun.step(
f"Write to file with cached extension and check if they are cached."
):
for ext in extensions:
dd = (
Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}")
.count(dd_count).block_size(dd_size))
dd.run()
sync()
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(
Unit.Blocks4096) != (extensions.index(ext) + 1) * dd_count:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
def test_ioclass_file_size(filesystem):
"""
title: Test IO classification by file size.
description: Test if file size classification works properly.
pass_criteria:
- No kernel bug.
- IO is classified properly based on IO class rule with file size.
"""
# File size IO class rules are configured in a way that each tested file size is unambiguously
# classified.
# Firstly write operations are tested (creation of files), secondly read operations.
base_size = Size(random.randint(50, 1000) * 2, Unit.Blocks4096)
size_to_class = {
base_size: 1,
base_size - Unit.Blocks4096: 2,
base_size + Unit.Blocks4096: 3,
base_size / 2: 4,
base_size / 2 - Unit.Blocks4096: 4,
base_size / 2 + Unit.Blocks4096: 2,
base_size * 2: 5,
base_size * 2 - Unit.Blocks4096: 3,
base_size * 2 + Unit.Blocks4096: 5,
}
with TestRun.step("Prepare cache and core."):
cache, core = prepare(default_allocation="1.00")
with TestRun.step("Prepare and load IO class config."):
load_file_size_io_classes(cache, base_size)
with TestRun.step(
f"Prepare {filesystem.name} filesystem and mount {core.path} "
f"at {mountpoint}."):
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
with TestRun.step(
"Create files belonging to different IO classes (classification by writes)."
):
test_files = []
for size, ioclass_id in size_to_class.items():
occupancy_before = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.occupancy
file_path = f"{mountpoint}/test_file_{size.get_value()}"
Dd().input("/dev/zero").output(file_path).oflag("sync").block_size(
size).count(1).run()
sync()
drop_caches(DropCachesMode.ALL)
occupancy_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.occupancy
if occupancy_after != occupancy_before + size:
TestRun.fail("File not cached properly!\n"
f"Expected {occupancy_before + size}\n"
f"Actual {occupancy_after}")
test_files.append(File(file_path).refresh_item())
sync()
drop_caches(DropCachesMode.ALL)
with TestRun.step("Move all files to 'unclassified' IO class."):
ioclass_config.remove_ioclass_config(
ioclass_config_path=ioclass_config_path)
ioclass_config.create_ioclass_config(
add_default_rule=False, ioclass_config_path=ioclass_config_path)
ioclass_config.add_ioclass(
ioclass_id=0,
eviction_priority=22,
allocation="1.00",
rule="unclassified",
ioclass_config_path=ioclass_config_path,
)
ioclass_config.add_ioclass(
ioclass_id=6,
eviction_priority=1,
allocation="0.00",
rule=f"metadata",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
occupancy_before = cache.get_io_class_statistics(
io_class_id=0).usage_stats.occupancy
for file in test_files:
Dd().input(file.full_path).output("/dev/null").block_size(
file.size).run()
sync()
drop_caches(DropCachesMode.ALL)
occupancy_after = cache.get_io_class_statistics(
io_class_id=0).usage_stats.occupancy
occupancy_expected = occupancy_before + file.size
if occupancy_after != occupancy_expected:
TestRun.fail("File not reclassified properly!\n"
f"Expected {occupancy_expected}\n"
f"Actual {occupancy_after}")
occupancy_before = occupancy_after
sync()
drop_caches(DropCachesMode.ALL)
with TestRun.step("Restore IO class configuration."):
ioclass_config.remove_ioclass_config(
ioclass_config_path=ioclass_config_path)
ioclass_config.create_ioclass_config(
add_default_rule=False, ioclass_config_path=ioclass_config_path)
ioclass_config.add_ioclass(
ioclass_id=0,
eviction_priority=22,
allocation="1.00",
rule="unclassified",
ioclass_config_path=ioclass_config_path,
)
load_file_size_io_classes(cache, base_size)
with TestRun.step(
"Read files belonging to different IO classes (classification by reads)."
):
# CAS device should be unmounted and mounted because data can be sometimes still cached by
# OS cache so occupancy statistics will not match
core.unmount()
core.mount(mountpoint)
for file in test_files:
ioclass_id = size_to_class[file.size]
occupancy_before = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.occupancy
Dd().input(file.full_path).output("/dev/null").block_size(
file.size).run()
sync()
drop_caches(DropCachesMode.ALL)
occupancy_after = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.occupancy
actual_blocks = occupancy_after.get_value(Unit.Blocks4096)
expected_blocks = (occupancy_before + file.size).get_value(
Unit.Blocks4096)
if actual_blocks != expected_blocks:
TestRun.fail("File not reclassified properly!\n"
f"Expected {occupancy_before + file.size}\n"
f"Actual {occupancy_after}")
sync()
drop_caches(DropCachesMode.ALL)
def test_ioclass_resize(cache_line_size, new_occupancy):
"""
title: Resize ioclass
description: |
Add ioclass, fill it with data, change it's size and check if new
limit is respected
pass_criteria:
- Occupancy threshold is respected
"""
with TestRun.step("Prepare CAS device"):
cache, core = prepare(cache_mode=CacheMode.WT,
cache_line_size=cache_line_size)
cache_size = cache.get_statistics().config_stats.cache_size
with TestRun.step("Disable udev"):
Udev.disable()
with TestRun.step(
f"Prepare filesystem and mount {core.path} at {mountpoint}"):
filesystem = Filesystem.xfs
core.create_filesystem(filesystem)
core.mount(mountpoint)
sync()
with TestRun.step("Prepare test dirs"):
IoclassConfig = recordclass("IoclassConfig",
"id eviction_prio max_occupancy dir_path")
io_class = IoclassConfig(2, 3, 0.10, f"{mountpoint}/A")
fs_utils.create_directory(io_class.dir_path, parents=True)
with TestRun.step("Remove old ioclass config"):
ioclass_config.remove_ioclass_config()
ioclass_config.create_ioclass_config(False)
with TestRun.step("Add default ioclasses"):
ioclass_config.add_ioclass(ioclass_id=1,
rule="metadata&done",
eviction_priority=1,
allocation="1.00",
ioclass_config_path=ioclass_config_path)
ioclass_config.add_ioclass(*str(IoClass.default(
allocation="0.00")).split(","))
with TestRun.step("Add directory for ioclass"):
ioclass_config.add_ioclass(
io_class.id,
f"directory:{io_class.dir_path}&done",
io_class.eviction_prio,
f"{io_class.max_occupancy:0.2f}",
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step("Reset cache stats"):
cache.purge_cache()
cache.reset_counters()
with TestRun.step("Check initial occupancy"):
occupancy = get_io_class_occupancy(cache, io_class.id)
if occupancy.get_value() != 0:
TestRun.LOGGER.error(
f"Incorrect inital occupancy for ioclass id: {io_class.id}."
f" Expected 0, got: {occupancy}")
with TestRun.step(f"Perform IO with size equal to cache size"):
run_io_dir(f"{io_class.dir_path}/tmp_file",
int((cache_size) / Unit.Blocks4096))
with TestRun.step(
"Check if the ioclass did not exceed specified occupancy"):
actuall_occupancy = get_io_class_occupancy(cache, io_class.id)
occupancy_limit = ((io_class.max_occupancy * cache_size).align_up(
Unit.Blocks4096.get_value()).set_unit(Unit.Blocks4096))
# Divergency may be casued be rounding max occupancy
if actuall_occupancy > occupancy_limit + Size(100, Unit.Blocks4096):
TestRun.LOGGER.error(
f"Occupancy for ioclass id exceeded: {io_class.id}. "
f"Limit: {occupancy_limit}, actuall: {actuall_occupancy}")
with TestRun.step(
f"Resize ioclass from {io_class.max_occupancy*100}% to {new_occupancy}%"
" cache occupancy"):
io_class.max_occupancy = new_occupancy / 100
ioclass_config.remove_ioclass_config()
ioclass_config.create_ioclass_config(False)
ioclass_config.add_ioclass(*str(IoClass.default(
allocation="0.00")).split(","))
ioclass_config.add_ioclass(ioclass_id=1,
rule="metadata&done",
eviction_priority=1,
allocation="1.00",
ioclass_config_path=ioclass_config_path)
ioclass_config.add_ioclass(
io_class.id,
f"directory:{io_class.dir_path}&done",
io_class.eviction_prio,
f"{io_class.max_occupancy:0.2f}",
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(f"Perform IO with size equal to cache size"):
run_io_dir(f"{io_class.dir_path}/tmp_file",
int((cache_size) / Unit.Blocks4096))
with TestRun.step(
"Check if the ioclass did not exceed specified occupancy"):
actuall_occupancy = get_io_class_occupancy(cache, io_class.id)
occupancy_limit = ((io_class.max_occupancy * cache_size).align_up(
Unit.Blocks4096.get_value()).set_unit(Unit.Blocks4096))
# Divergency may be casued be rounding max occupancy
if actuall_occupancy > occupancy_limit + Size(100, Unit.Blocks4096):
TestRun.LOGGER.error(
f"Occupancy for ioclass id exceeded: {io_class.id}. "
f"Limit: {occupancy_limit}, actuall: {actuall_occupancy}")
def test_ioclass_file_extension():
"""
title: Test IO classification by file extension.
description: Test if file extension classification works properly.
pass_criteria:
- No kernel bug.
- IO is classified properly based on IO class rule with file extension.
"""
iterations = 50
ioclass_id = 1
tested_extension = "tmp"
wrong_extensions = ["tm", "tmpx", "txt", "t", "", "123", "tmp.xx"]
dd_size = Size(4, Unit.KibiByte)
dd_count = 10
dd = (Dd().input("/dev/zero").output(
f"{mountpoint}/test_file.{tested_extension}").count(
dd_count).block_size(dd_size))
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Create and load IO class config."):
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"extension:{tested_extension}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(
f"Prepare filesystem and mount {core.path} at {mountpoint}."):
core.create_filesystem(Filesystem.ext3)
core.mount(mountpoint)
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step(
f"Write to file with cached extension and check if it is properly cached."
):
for i in range(iterations):
dd.run()
sync()
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != (i + 1) * dd_count:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step(
f"Write to file with not cached extension and check if it is not cached."
):
for ext in wrong_extensions:
dd = (
Dd().input("/dev/zero").output(f"{mountpoint}/test_file.{ext}")
.count(dd_count).block_size(dd_size))
dd.run()
sync()
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != 0:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
def test_ioclass_file_name_prefix():
"""
title: Test IO classification by file name prefix.
description: Test if file name prefix classification works properly.
pass_criteria:
- No kernel bug.
- IO is classified properly based on IO class rule with file name prefix.
"""
ioclass_id = 1
cached_files = ["test", "test.txt", "test1", "test1.txt"]
not_cached_files = ["file1", "file2", "file4", "file5", "tes"]
dd_size = Size(4, Unit.KibiByte)
dd_count = 10
with TestRun.step("Prepare cache and core."):
cache, core = prepare()
with TestRun.step("Create and load IO class config."):
ioclass_config.remove_ioclass_config()
ioclass_config.create_ioclass_config(False)
# Avoid caching anything else than files with specified prefix
ioclass_config.add_ioclass(
ioclass_id=0,
eviction_priority=255,
allocation="0.00",
rule=f"unclassified",
ioclass_config_path=ioclass_config_path,
)
# Enables file with specified prefix to be cached
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"file_name_prefix:test&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(
f"Prepare filesystem and mount {core.path} at {mountpoint}"):
previous_occupancy = cache.get_occupancy()
core.create_filesystem(Filesystem.ext3)
core.mount(mountpoint)
current_occupancy = cache.get_occupancy()
if previous_occupancy.get_value() > current_occupancy.get_value():
TestRun.fail(
f"Current occupancy ({str(current_occupancy)}) is lower "
f"than before ({str(previous_occupancy)}).")
# Filesystem creation caused metadata IO which is not supposed
# to be cached
# Check if files with proper prefix are cached
with TestRun.step(f"Write files which are supposed to be cached and check "
f"if they are cached."):
for f in cached_files:
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/{f}").count(
dd_count).block_size(dd_size))
dd.run()
sync()
current_occupancy = cache.get_occupancy()
expected_occupancy = previous_occupancy + (dd_size * dd_count)
if current_occupancy != expected_occupancy:
TestRun.fail(f"Current occupancy value is not valid. "
f"(Expected: {str(expected_occupancy)}, "
f"actual: {str(current_occupancy)})")
previous_occupancy = current_occupancy
with TestRun.step("Flush cache."):
cache.flush_cache()
# Check if file with improper extension is not cached
with TestRun.step(
f"Write files which are not supposed to be cached and check if "
f"they are not cached."):
for f in not_cached_files:
dd = (Dd().input("/dev/zero").output(f"{mountpoint}/{f}").count(
dd_count).block_size(dd_size))
dd.run()
sync()
current_occupancy = cache.get_occupancy()
if current_occupancy != previous_occupancy:
TestRun.fail(f"Current occupancy value is not valid. "
f"(Expected: {str(previous_occupancy)}, "
f"actual: {str(current_occupancy)})")
def test_ioclass_pid():
"""
title: Test IO classification by process id.
description: Check if data generated by process with particular id is cached.
pass_criteria:
- No kernel bug.
- IO is classified properly based on process generating IO id.
"""
ioclass_id = 1
iterations = 20
dd_count = 100
dd_size = Size(4, Unit.KibiByte)
with TestRun.step("Prepare cache, core and disable udev."):
cache, core = prepare()
Udev.disable()
with TestRun.step("Prepare dd command."):
# Since 'dd' has to be executed right after writing pid to 'ns_last_pid',
# 'dd' command is created and is appended to 'echo' command instead of running it
dd_command = str(Dd().input("/dev/zero").output(
core.path).count(dd_count).block_size(dd_size))
for _ in TestRun.iteration(range(iterations)):
with TestRun.step("Flush cache."):
cache.flush_cache()
with TestRun.step("Prepare and load IO class config."):
output = TestRun.executor.run("cat /proc/sys/kernel/ns_last_pid")
if output.exit_code != 0:
raise Exception(
f"Failed to retrieve pid. stdout: {output.stdout} \n stderr :{output.stderr}"
)
# Few pids might be used by system during test preparation
pid = int(output.stdout) + 50
ioclass_config.add_ioclass(
ioclass_id=ioclass_id,
eviction_priority=1,
allocation="1.00",
rule=f"pid:eq:{pid}&done",
ioclass_config_path=ioclass_config_path,
)
casadm.load_io_classes(cache_id=cache.cache_id,
file=ioclass_config_path)
with TestRun.step(f"Run dd with pid {pid}."):
# pid saved in 'ns_last_pid' has to be smaller by one than target dd pid
dd_and_pid_command = (
f"echo {pid-1} > /proc/sys/kernel/ns_last_pid && {dd_command}")
output = TestRun.executor.run(dd_and_pid_command)
if output.exit_code != 0:
raise Exception(
f"Failed to run dd with target pid. "
f"stdout: {output.stdout} \n stderr :{output.stderr}")
sync()
with TestRun.step("Check if data was cached properly."):
dirty = cache.get_io_class_statistics(
io_class_id=ioclass_id).usage_stats.dirty
if dirty.get_value(Unit.Blocks4096) != dd_count:
TestRun.LOGGER.error(f"Wrong amount of dirty data ({dirty}).")
ioclass_config.remove_ioclass(ioclass_id)
