def backup_with_backing_file_test(backup_target, # NOQA
grpc_backing_controller, # NOQA
grpc_backing_replica1, # NOQA
grpc_backing_replica2): # NOQA
address = grpc_backing_controller.address
dev = get_backing_dev(grpc_backing_replica1,
grpc_backing_replica2,
grpc_backing_controller)
offset = 0
length = 256
snap0 = cmd.snapshot_create(address)
before = read_dev(dev, offset, length)
assert before != ""
snap0_checksum = checksum_dev(dev)
exists = read_from_backing_file(offset, length)
assert before == exists
backup0_info = create_backup(address, snap0, backup_target)
assert backup0_info["VolumeName"] == VOLUME_BACKING_NAME
backup_test(dev, address, VOLUME_BACKING_NAME,
ENGINE_BACKING_NAME, backup_target)
restore_with_frontend(address, ENGINE_BACKING_NAME,
backup0_info["URL"])
after = read_dev(dev, offset, length)
assert before == after
c = checksum_dev(dev)
assert c == snap0_checksum
rm_backups(address, ENGINE_BACKING_NAME, [backup0_info["URL"]])
def test_snapshot_revert_with_backing_file(grpc_backing_controller, # NOQA
grpc_backing_replica1, # NOQA
grpc_backing_replica2): # NOQA
address = grpc_backing_controller.address
dev = get_backing_dev(grpc_backing_replica1, grpc_backing_replica2,
grpc_backing_controller)
offset = 0
length = 256
snap0 = cmd.snapshot_create(address)
before = read_dev(dev, offset, length)
assert before != ""
info = cmd.snapshot_info(address)
assert len(info) == 2
assert VOLUME_HEAD in info
assert snap0 in info
exists = read_from_backing_file(offset, length)
assert before == exists
snapshot_revert_test(dev, address, ENGINE_BACKING_NAME)
snapshot_revert_with_frontend(address, ENGINE_BACKING_NAME, snap0)
after = read_dev(dev, offset, length)
assert before == after
def backup_test(
dev,
address, # NOQA
volume_name,
engine_name,
backup_target):
offset = 0
length = 128
snap1_data = random_string(length)
verify_data(dev, offset, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
backup1_info = create_backup(address, snap1, backup_target)
assert backup1_info["VolumeName"] == volume_name
assert backup1_info["Size"] == BLOCK_SIZE_STR
snap2_data = random_string(length)
verify_data(dev, offset, snap2_data)
snap2_checksum = checksum_dev(dev)
snap2 = cmd.snapshot_create(address)
backup2_info = create_backup(address, snap2, backup_target)
assert backup2_info["VolumeName"] == volume_name
assert backup2_info["Size"] == BLOCK_SIZE_STR
snap3_data = random_string(length)
verify_data(dev, offset, snap3_data)
snap3_checksum = checksum_dev(dev)
snap3 = cmd.snapshot_create(address)
backup3_info = create_backup(address, snap3, backup_target)
assert backup3_info["VolumeName"] == volume_name
assert backup3_info["Size"] == BLOCK_SIZE_STR
restore_with_frontend(address, engine_name, backup3_info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap3_data
c = checksum_dev(dev)
assert c == snap3_checksum
rm_backups(address, engine_name, [backup3_info["URL"]])
restore_with_frontend(address, engine_name, backup1_info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap1_data
c = checksum_dev(dev)
assert c == snap1_checksum
rm_backups(address, engine_name, [backup1_info["URL"]])
restore_with_frontend(address, engine_name, backup2_info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap2_data
c = checksum_dev(dev)
assert c == snap2_checksum
rm_backups(address, engine_name, [backup2_info["URL"]])
def backup_hole_with_backing_file_test(backup_target, # NOQA
grpc_backing_controller, # NOQA
grpc_backing_replica1, # NOQA
grpc_backing_replica2): # NOQA
address = grpc_backing_controller.address
dev = get_backing_dev(grpc_backing_replica1,
grpc_backing_replica2,
grpc_backing_controller)
offset1 = 512
length1 = 256
offset2 = 640
length2 = 256
boundary_offset = 0
boundary_length = 4100 # just pass 4096 into next 4k
hole_offset = 2 * 1024 * 1024
hole_length = 1024
snap1_data = random_string(length1)
verify_data(dev, offset1, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
boundary_data_backup1 = read_dev(dev, boundary_offset, boundary_length)
hole_data_backup1 = read_dev(dev, hole_offset, hole_length)
backup1_info = create_backup(address, snap1, backup_target)
snap2_data = random_string(length2)
verify_data(dev, offset2, snap2_data)
snap2_checksum = checksum_dev(dev)
snap2 = cmd.snapshot_create(address)
boundary_data_backup2 = read_dev(dev, boundary_offset, boundary_length)
hole_data_backup2 = read_dev(dev, hole_offset, hole_length)
backup2_info = create_backup(address, snap2, backup_target)
restore_with_frontend(address, ENGINE_BACKING_NAME,
backup1_info["URL"])
readed = read_dev(dev, boundary_offset, boundary_length)
assert readed == boundary_data_backup1
readed = read_dev(dev, hole_offset, hole_length)
assert readed == hole_data_backup1
c = checksum_dev(dev)
assert c == snap1_checksum
restore_with_frontend(address, ENGINE_BACKING_NAME,
backup2_info["URL"])
readed = read_dev(dev, boundary_offset, boundary_length)
assert readed == boundary_data_backup2
readed = read_dev(dev, hole_offset, hole_length)
assert readed == hole_data_backup2
c = checksum_dev(dev)
assert c == snap2_checksum
def snapshot_tree_verify_backup_node(
grpc_controller, grpc_replica1, grpc_replica2,
address, engine_name, offset, length, backup, data, name): # NOQA
reset_volume(grpc_controller,
grpc_replica1, grpc_replica2)
dev = get_blockdev(grpc_controller.volume_get().name)
restore_with_frontend(address, engine_name, backup[name])
readed = read_dev(dev, offset, length)
assert readed == data[name]
def test_backup_lock(
grpc_replica1,
grpc_replica2, # NOQA
grpc_controller,
backup_targets): # NOQA
"""
Test backup locks
Context:
The idea is to implement a locking mechanism that utilizes the backupstore,
to prevent the following dangerous cases of concurrent operations.
- prevent backup deletion during backup restoration
- prevent backup deletion while a backup is in progress
- prevent backup creation during backup deletion
- prevent backup restoration during backup deletion
Steps:
1. Create a volume(1) and attach to the current node
2. create a backup(1) of volume(1)
3. verify backup(1) creation completed
4. write some data to volume(1)
5. create an active lock of type Delete
6. create a backup(2) of volume(1)
7. verify backup(2) creation timed out
8. delete active lock of type Delete
9. create an active lock of type Delete
10. restore backup(1)
11. verify backup(1) restore timed out
12. delete active lock of type Delete
13. restore backup(1)
14. verify backup(1) restore completed
15. create an active lock of type Restore
16. delete backup(1)
17. verify backup(1) deletion timed out
18. delete active lock of type Restore
19. delete backup(1)
20. verify backup(1) deletion completed
21. cleanup
"""
for backup_target in backup_targets:
dev = get_dev(grpc_replica1, grpc_replica2, grpc_controller)
# create a regular backup
address = grpc_controller.address
offset = 0
length = 128
snap1_data = random_string(length)
verify_data(dev, offset, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
# create a backup to create the volume
info = create_backup(address, snap1, backup_target)
assert info["VolumeName"] == VOLUME_NAME
assert info["Size"] == BLOCK_SIZE_STR
assert snap1 in info["SnapshotName"]
# backup should error out with timeout
# because of delete lock
create_delete_lock(True)
with pytest.raises(subprocess.CalledProcessError):
create_backup(address, snap1, backup_target)
remove_lock_file(DELETE_LOCK)
# restore should error out with timeout
# because of delete lock
create_delete_lock(True)
with pytest.raises(subprocess.CalledProcessError):
restore_with_frontend(address, ENGINE_NAME, info["URL"])
remove_lock_file(DELETE_LOCK)
# restore should succeed now, that there is no active delete lock
restore_with_frontend(address, ENGINE_NAME, info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap1_data
c = checksum_dev(dev)
assert c == snap1_checksum
# delete should error out with timeout
# because of restore lock
create_restore_lock(True)
with pytest.raises(subprocess.CalledProcessError):
rm_backups(address, ENGINE_NAME, [info["URL"]])
remove_lock_file(RESTORE_LOCK)
# delete should succeed now, that there is no active restore lock
rm_backups(address, ENGINE_NAME, [info["URL"]])
# cleanup volume 1
cmd.sync_agent_server_reset(address)
cleanup_controller(grpc_controller)
cleanup_replica(grpc_replica1)
cleanup_replica(grpc_replica2)
def test_backup_incremental_logic(grpc_replica1, grpc_replica2,
grpc_controller, backup_targets): # NOQA
for backup_target in backup_targets:
dev = get_dev(grpc_replica1, grpc_replica2, grpc_controller)
address = grpc_controller.address
volume_name = VOLUME_NAME
engine_name = ENGINE_NAME
offset = 0
length = 128
# initial backup
snap1_data = random_string(length)
verify_data(dev, offset, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
backup1_info = create_backup(address, snap1, backup_target)
assert backup1_info["IsIncremental"] is False
# delta backup on top of initial backup
snap2_data = random_string(int(length / 2))
verify_data(dev, offset, snap2_data)
snap2 = cmd.snapshot_create(address)
backup2_info = create_backup(address, snap2, backup_target)
assert backup2_info["IsIncremental"] is True
# delete the volume
cmd.sync_agent_server_reset(address)
grpc_controller = cleanup_controller(grpc_controller)
grpc_replica1 = cleanup_replica(grpc_replica1)
grpc_replica2 = cleanup_replica(grpc_replica2)
# recreate the volume
dev = get_dev(grpc_replica1,
grpc_replica2,
grpc_controller,
clean_backup_dir=False)
# empty initial backup after volume recreation
snap3 = cmd.snapshot_create(address)
backup3_info = create_backup(address, snap3, backup_target)
assert backup3_info["VolumeName"] == volume_name
assert backup3_info["Size"] == '0'
assert backup3_info["IsIncremental"] is False
# write half of snap1 onto head
snap4_data = snap1_data[:int(length / 2)]
assert len(snap4_data) == int(length / 2)
verify_data(dev, offset, snap4_data)
snap4_checksum = checksum_dev(dev)
assert snap4_checksum != snap1_checksum
snap4 = cmd.snapshot_create(address)
backup4_info = create_backup(address, snap4, backup_target)
assert backup4_info["IsIncremental"] is True
# restore initial backup
reset_volume(grpc_controller, grpc_replica1, grpc_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, engine_name, backup1_info["URL"])
assert read_dev(dev, offset, length) == snap1_data
assert checksum_dev(dev) == snap1_checksum
# restore final backup (half of snap1)
reset_volume(grpc_controller, grpc_replica1, grpc_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, engine_name, backup4_info["URL"])
assert checksum_dev(dev) == snap4_checksum
assert snap4_checksum != snap1_checksum
data = read_dev(dev, offset, length)
assert data[:int(length / 2)] == snap4_data
assert data[int(length / 2):] == '\x00' * int(length / 2)
rm_backups(address, engine_name, [
backup1_info["URL"], backup2_info["URL"], backup3_info["URL"],
backup4_info["URL"]
])
cmd.sync_agent_server_reset(address)
cleanup_controller(grpc_controller)
cleanup_replica(grpc_replica1)
cleanup_replica(grpc_replica2)
def test_backup_S3_latest_unavailable(
grpc_replica1,
grpc_replica2, # NOQA
grpc_controller,
backup_targets): # NOQA
for backup_target in backup_targets:
if "s3://" not in backup_target:
continue
dev = get_dev(grpc_replica1, grpc_replica2, grpc_controller)
address = grpc_controller.address
volume_name = VOLUME_NAME
engine_name = ENGINE_NAME
offset = 0
length = 128
# initial backup
snap1_data = random_string(length)
verify_data(dev, offset, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
backup1_info = create_backup(address, snap1, backup_target)
# backup to be unavailable
snap2_data = random_string(length)
verify_data(dev, offset, snap2_data)
snap2 = cmd.snapshot_create(address)
backup2_info = create_backup(address, snap2, backup_target)
# the gc after the restore will clean up the missing backup
cfg = findfile(BACKUP_DIR, "backup_" + backup2_info["Name"] + ".cfg")
os.remove(cfg)
# final full backup after unavailable backup
snap3_data = random_string(length)
verify_data(dev, offset, snap3_data)
snap3_checksum = checksum_dev(dev)
snap3 = cmd.snapshot_create(address)
backup3_info = create_backup(address, snap3, backup_target)
assert backup3_info["VolumeName"] == volume_name
assert backup3_info["Size"] == BLOCK_SIZE_STR
# write some stuff on head
head_data = random_string(length)
verify_data(dev, offset, head_data)
# test restore of the initial backup
reset_volume(grpc_controller, grpc_replica1, grpc_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, engine_name, backup1_info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap1_data
c = checksum_dev(dev)
assert c == snap1_checksum
# test a restore for the final backup
reset_volume(grpc_controller, grpc_replica1, grpc_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, engine_name, backup3_info["URL"])
readed = read_dev(dev, offset, length)
assert readed == snap3_data
c = checksum_dev(dev)
assert c == snap3_checksum
rm_backups(address, engine_name,
[backup1_info["URL"], backup3_info["URL"]])
cmd.sync_agent_server_reset(address)
cleanup_controller(grpc_controller)
cleanup_replica(grpc_replica1)
cleanup_replica(grpc_replica2)
def snapshot_tree_verify_node(dev, address, engine_name,
offset, length, snap, data, name):
snapshot_revert_with_frontend(address, engine_name, snap[name])
readed = read_dev(dev, offset, length)
assert readed == data[name]
def restore_to_file_with_backing_file_test(
backup_target, # NOQA
grpc_backing_controller, # NOQA
grpc_backing_replica1, # NOQA
grpc_backing_replica2): # NOQA
address = grpc_backing_controller.address
backing_dev = get_dev(grpc_backing_replica1, grpc_backing_replica2,
grpc_backing_controller)
length0 = 4 * 1024
length1 = 256
length2 = 128
offset0 = 0
offset1 = length1 + offset0
offset2 = length2 + offset0
output_raw_path = file(OUTPUT_FILE_RAW)
output_qcow2_path = file(OUTPUT_FILE_QCOW2)
# create 1 empty snapshot.
# data in output image == data in backing
check_backing()
check_empty_volume(backing_dev)
snap0 = cmd.snapshot_create(address)
backup = create_backup(address, snap0, backup_target)["URL"]
volume_data = read_dev(backing_dev, offset0, length0)
backing_data = read_from_backing_file(offset0, length0)
dev_checksum = checksum_dev(backing_dev)
assert volume_data != ""
assert volume_data == backing_data
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_raw_path, IMAGE_FORMAT_RAW)
output0_raw = read_file(output_raw_path, offset0, length0)
output0_checksum = checksum_data(
read_file(output_raw_path, 0, SIZE).encode('utf-8'))
assert output0_raw == backing_data
assert output0_checksum == dev_checksum
os.remove(output_raw_path)
assert not os.path.exists(output_raw_path)
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_qcow2_path, IMAGE_FORMAT_QCOW2)
output0_qcow2 = read_qcow2_file_without_backing_file(
output_qcow2_path, offset0, length0)
output0_checksum = checksum_data(
read_qcow2_file_without_backing_file(output_qcow2_path, 0, SIZE))
assert output0_qcow2.decode('utf-8') == backing_data
assert output0_qcow2.decode('utf-8') == volume_data
assert output0_checksum == dev_checksum
os.remove(output_qcow2_path)
assert not os.path.exists(output_qcow2_path)
rm_backups(address, ENGINE_BACKING_NAME, [backup])
# create 1 snapshot with 256B data.
# output = snap1(offset0, length1) + backing(offset1, ...)
snap1_data = random_string(length1)
verify_data(backing_dev, offset0, snap1_data)
snap1 = cmd.snapshot_create(address)
backup = create_backup(address, snap1, backup_target)["URL"]
volume_data = read_dev(backing_dev, offset0, length0)
backing_data = read_from_backing_file(offset1, length0 - offset1)
dev_checksum = checksum_dev(backing_dev)
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_raw_path, IMAGE_FORMAT_RAW)
output1_raw_snap1 = read_file(output_raw_path, offset0, length1)
output1_raw_backing = read_file(output_raw_path, offset1,
length0 - offset1)
output1_checksum = checksum_data(
read_file(output_raw_path, 0, SIZE).encode('utf-8'))
assert output1_raw_snap1 == snap1_data
assert output1_raw_backing == backing_data
assert output1_raw_snap1 + output1_raw_backing == volume_data
assert output1_checksum == dev_checksum
os.remove(output_raw_path)
assert not os.path.exists(output_raw_path)
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_qcow2_path, IMAGE_FORMAT_QCOW2)
output1_qcow2_snap1 = read_qcow2_file_without_backing_file(
output_qcow2_path, offset0, length1)
output1_qcow2_backing = read_qcow2_file_without_backing_file(
output_qcow2_path, offset1, length0 - offset1)
output1_checksum = checksum_data(
read_qcow2_file_without_backing_file(output_qcow2_path, 0, SIZE))
assert output1_qcow2_snap1.decode('utf-8') == snap1_data
assert output1_qcow2_backing.decode('utf-8') == backing_data
assert output1_qcow2_snap1.decode('utf-8') + \
output1_qcow2_backing.decode('utf-8') == volume_data
assert output1_checksum == dev_checksum
os.remove(output_qcow2_path)
assert not os.path.exists(output_qcow2_path)
snapshot_revert_with_frontend(address, ENGINE_BACKING_NAME, snap0)
rm_snaps(address, [snap1])
rm_backups(address, ENGINE_BACKING_NAME, [backup])
check_backing()
check_empty_volume(backing_dev)
# create 2 snapshots with 256B data and 128B data
# output = snap2(offset0, length1 - length2) +
# snap1(offset2, length2) + backing(offset2, ...)
snap1_data = random_string(length1)
verify_data(backing_dev, offset0, snap1_data)
snap1 = cmd.snapshot_create(address)
snap2_data = random_string(length2)
verify_data(backing_dev, offset0, snap2_data)
snap2 = cmd.snapshot_create(address)
backup = create_backup(address, snap2, backup_target)["URL"]
volume_data = read_dev(backing_dev, offset0, length0)
backing_data = read_from_backing_file(offset1, length0 - offset1)
dev_checksum = checksum_dev(backing_dev)
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_raw_path, IMAGE_FORMAT_RAW)
output2_raw_snap2 = read_file(output_raw_path, offset0, length2)
output2_raw_snap1 = read_file(output_raw_path, offset2, length1 - length2)
output2_raw_backing = read_file(output_raw_path, offset1,
length0 - offset1)
output2_checksum = checksum_data(
read_file(output_raw_path, 0, SIZE).encode('utf-8'))
assert output2_raw_snap2 == snap2_data
assert output2_raw_snap1 == snap1_data[offset2:length1]
assert output2_raw_backing == backing_data
assert \
volume_data == \
output2_raw_snap2 + output2_raw_snap1 + output2_raw_backing
assert output2_checksum == dev_checksum
os.remove(output_raw_path)
assert not os.path.exists(output_raw_path)
cmd.restore_to_file(address, backup, file(BACKING_FILE_QCOW),
output_qcow2_path, IMAGE_FORMAT_QCOW2)
output2_qcow2_snap2 = read_qcow2_file_without_backing_file(
output_qcow2_path, offset0, length2)
output2_qcow2_snap1 = read_qcow2_file_without_backing_file(
output_qcow2_path, offset2, length1 - length2)
output2_qcow2_backing = read_qcow2_file_without_backing_file(
output_qcow2_path, offset1, length0 - offset1)
output2_checksum = checksum_data(
read_qcow2_file_without_backing_file(output_qcow2_path, 0, SIZE))
assert output2_qcow2_snap2.decode('utf-8') == snap2_data
assert output2_qcow2_snap1.decode('utf-8') == snap1_data[offset2:length1]
assert output2_qcow2_backing.decode('utf-8') == backing_data
assert \
volume_data == \
output2_qcow2_snap2.decode('utf-8') + \
output2_qcow2_snap1.decode('utf-8') + \
output1_qcow2_backing.decode('utf-8')
assert output2_checksum == dev_checksum
os.remove(output_qcow2_path)
assert not os.path.exists(output_qcow2_path)
snapshot_revert_with_frontend(address, ENGINE_BACKING_NAME, snap0)
rm_snaps(address, [snap1, snap2])
rm_backups(address, ENGINE_BACKING_NAME, [backup])
check_backing()
check_empty_volume(backing_dev)
def check_empty_volume(dev, offset=0, length=4 * 1024):
backing_data = read_from_backing_file(offset, length)
empty_volume_data = read_dev(dev, offset, length)
assert backing_data == empty_volume_data
def snapshot_tree_verify_backup_node(dev, address, engine_name, offset, length,
backup, data, name):
restore_with_frontend(address, engine_name, backup[name])
readed = read_dev(dev, offset, length)
assert readed == data[name]
def backup_hole_with_backing_file_test(
backup_target, # NOQA
grpc_backing_controller, # NOQA
grpc_backing_replica1, # NOQA
grpc_backing_replica2): # NOQA
address = grpc_backing_controller.address
dev = get_dev(grpc_backing_replica1, grpc_backing_replica2,
grpc_backing_controller)
volume_name = grpc_backing_controller.volume_get().name
assert volume_name == VOLUME_BACKING_NAME
offset1 = 512
length1 = 256
offset2 = 640
length2 = 256
boundary_offset = 0
boundary_length = 4100 # just pass 4096 into next 4k
hole_offset = 2 * 1024 * 1024
hole_length = 1024
snap1_data = random_string(length1)
verify_data(dev, offset1, snap1_data)
snap1_checksum = checksum_dev(dev)
snap1 = cmd.snapshot_create(address)
boundary_data_backup1 = read_dev(dev, boundary_offset, boundary_length)
hole_data_backup1 = read_dev(dev, hole_offset, hole_length)
backup1_info = create_backup(address,
snap1,
backup_target,
backing_image_name=BACKING_IMAGE_NAME,
backing_image_url=BACKING_IMAGE_URL)
snap2_data = random_string(length2)
verify_data(dev, offset2, snap2_data)
snap2_checksum = checksum_dev(dev)
snap2 = cmd.snapshot_create(address)
boundary_data_backup2 = read_dev(dev, boundary_offset, boundary_length)
hole_data_backup2 = read_dev(dev, hole_offset, hole_length)
backup2_info = create_backup(address,
snap2,
backup_target,
backing_image_name=BACKING_IMAGE_NAME,
backing_image_url=BACKING_IMAGE_URL)
assert backup2_info["VolumeBackingImageName"] == BACKING_IMAGE_NAME
assert backup2_info["VolumeBackingImageURL"] == BACKING_IMAGE_URL
reset_volume(grpc_backing_controller, grpc_backing_replica1,
grpc_backing_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, ENGINE_BACKING_NAME, backup1_info["URL"])
readed = read_dev(dev, boundary_offset, boundary_length)
assert readed == boundary_data_backup1
readed = read_dev(dev, hole_offset, hole_length)
assert readed == hole_data_backup1
c = checksum_dev(dev)
assert c == snap1_checksum
reset_volume(grpc_backing_controller, grpc_backing_replica1,
grpc_backing_replica2)
dev = get_blockdev(volume_name)
restore_with_frontend(address, ENGINE_BACKING_NAME, backup2_info["URL"])
readed = read_dev(dev, boundary_offset, boundary_length)
assert readed == boundary_data_backup2
readed = read_dev(dev, hole_offset, hole_length)
assert readed == hole_data_backup2
c = checksum_dev(dev)
assert c == snap2_checksum
