def list_volumes(self):
LOG.debug('Entering EMCUnityBlockAPI.list_volumes')
volumes = []
cluster_luns = [lun for lun in self.client.get_lun()
if self._is_cluster_volume(lun.name)]
hosts = self.client.get_host()
for index, lun in enumerate(cluster_luns):
blockdevice_id = self._get_blockdevice_id_from_lun_name(lun.name)
for host in hosts:
if host.has_alu(lun):
attached_to = unicode(host.name)
break
else:
attached_to = None
vol = loopback._blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=lun.size_total,
attached_to=attached_to)
LOG.info('[Volume %s]: '
'volume_name=%s, volume_size=%s, attach_to=%s',
index,
lun.name,
lun.size_total,
attached_to)
volumes.append(vol)
LOG.debug('Exiting EMCUnityBlockAPI.list_volumes')
return volumes
def list_volumes(self):
volumes = []
cluster_luns = self._cluster_luns()
lun_storage_group_map = self._lun_storagegroup_map(
cluster_lun_ids=[l['lun_id'] for l in cluster_luns]
)
for each in cluster_luns:
lun_id = each['lun_id']
blockdevice_id = self._get_blockdevice_id_from_lun_name(
each['lun_name'].decode('ascii')
)
attached_to = None
try:
group_name, group = lun_storage_group_map[lun_id]
except KeyError:
# LUN is not attached anywhere.
pass
else:
if group_name == self._group:
# LUN attached here.
attached_to = unicode(self._hostname)
else:
# Lun attached elsewhere.
# A node can see that a LUN has been added to another
# storage group but that's all. It can't know whether the
# host in that foreign storage group has created a device
# for the LUN. As far as it knows, it's non-manifest. But
# problems occur because our BlockDeviceDeployer reports it
# as a non-manifest volume in the NodeState. The control
# service ends up seeing and reporting a DeployementState
# where a dataset is both manifest on the other node and
# non-manifest.
# The workarounds for now is to list the volume as attached
# to a non-existent compute_id. This only works because the
# local deployer only reports the state of locally attached
# and non-manifest datasets.
attached_to = UNKNOWN_COMPUTE_ID
size = int(1024*1024*1024*each['total_capacity_gb'])
vol = _blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=size,
attached_to=attached_to)
Message.new(operation=u'list_volumes_output',
blockdevice_id=blockdevice_id,
size=size,
attached_to=attached_to).write()
volumes.append(vol)
return volumes
def attach_volume(self, blockdevice_id, attach_to):
LOG.debug('Entering EMCVNXBlockAPI.attach_volume: '
'blockdevice_id=%s, attach_to=%s',
blockdevice_id, attach_to)
volume_name = self._build_volume_name_from_blockdevice_id(
blockdevice_id)
lun = self.client.get_lun(name=volume_name)
if self.client.is_lun_destroyed(lun):
raise blockdevice.UnknownVolume(blockdevice_id)
if self._lun_already_in_sg(lun):
raise blockdevice.AlreadyAttachedVolume(blockdevice_id)
host_info = self._build_host_info(self.host_ip, attach_to)
storage_group = self._assure_storage_group(host_info)
try:
hlu = self._assure_host_access(storage_group, lun)
except exception.VNXAluAlreadyAttachedError:
raise blockdevice.AlreadyAttachedVolume(blockdevice_id)
connection_properties = self.connector.build_connection_properties(
hlu, storage_group=storage_group)
self.connector.connect_volume(connection_properties['data'])
volume_size = self._gib_to_bytes(lun.total_capacity_gb)
volume = loopback._blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=volume_size,
attached_to=unicode(attach_to))
LOG.debug('Exiting EMCVNXBlockAPI.attach_volume: '
'storage_group=%s, volume_name=%s, volume_size=%s, hlu=%s, '
'target_prop=%s',
attach_to,
volume_name,
volume_size,
hlu,
connection_properties)
return volume
def attach_volume(self, blockdevice_id, attach_to):
LOG.debug('Entering EMCUnityBlockAPI.attach_volume: '
'blockdevice_id=%s, attach_to=%s',
blockdevice_id, attach_to)
volume_name = self._build_volume_name_from_blockdevice_id(
blockdevice_id)
lun = self.client.get_lun(name=volume_name)
if self.client.is_lun_destroyed(lun):
raise blockdevice.UnknownVolume(blockdevice_id)
if self._lun_already_in_host(lun):
raise blockdevice.AlreadyAttachedVolume(blockdevice_id)
host_info = self._build_host_info(attach_to)
host = self._assure_host(host_info)
try:
hlu = self._assure_host_access(host, lun)
except exception.UnityAluAlreadyAttachedError:
raise blockdevice.AlreadyAttachedVolume(blockdevice_id)
connection_properties = self.connector.build_connection_properties(
hlu, host=host)
self.connector.connect_volume(connection_properties['data'])
volume = loopback._blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=lun.size_total,
attached_to=unicode(attach_to))
LOG.debug('Exiting EMCUnityBlockAPI.attach_volume: '
'host=%s, volume_name=%s, volume_size=%s, hlu=%s, '
'target_prop=%s',
attach_to,
volume_name,
lun.size_total,
hlu,
connection_properties)
return volume
def list_volumes(self):
LOG.debug('Entering EMCVNXBlockAPI.list_volumes')
volumes = []
cluster_luns = [lun for lun in self.client.get_lun()
if self._is_cluster_volume(lun.name) and
not self.client.is_lun_destroyed(lun)]
storage_groups = self.client.get_storage_group()
for index, lun in enumerate(cluster_luns):
blockdevice_id = self._get_blockdevice_id_from_lun_name(lun.name)
for storage_group in storage_groups:
if storage_group.has_alu(lun):
attached_to = unicode(storage_group.name)
break
else:
attached_to = None
volume_size = self._gib_to_bytes(lun.total_capacity_gb)
vol = loopback._blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=volume_size,
attached_to=attached_to)
LOG.info('[Volume %s]: '
'volume_name=%s, volume_size=%s, attach_to=%s',
index,
lun.name,
volume_size,
attached_to)
volumes.append(vol)
LOG.debug('Exiting EMCVNXBlockAPI.list_volumes')
return volumes
def attach_volume(self, blockdevice_id, attach_to):
Message.new(operation=u'attach_volume',
blockdevice_id=blockdevice_id,
attach_to=attach_to).write()
lun_name = self._get_lun_name_from_blockdevice_id(blockdevice_id)
lun = self._client.get_lun_by_name(lun_name)
if lun == {}:
raise UnknownVolume(blockdevice_id)
alu = lun['lun_id']
rc, out = self._client.get_storage_group(self._group)
if rc != 0:
raise Exception(rc, out)
lunmap = self._client.parse_sg_content(out)['lunmap']
try:
# The LUN has already been added to this storage group....perhaps
# by a previous attempt to attach in which the OS device did not
# appear.
hlu = lunmap[alu]
except KeyError:
# Add LUN to storage group
hlu = self._choose_hlu(lunmap)
rc, out = self._client.add_volume_to_sg(str(hlu),
str(alu),
self._group)
if rc != 0:
if rc == 66:
raise AlreadyAttachedVolume(blockdevice_id)
else:
raise Exception(rc, out)
volume = _blockdevicevolume_from_blockdevice_id(
blockdevice_id=blockdevice_id,
size=int(lun['total_capacity_gb']*1024*1024*1024),
attached_to=unicode(attach_to)
)
# Rescan and wait for the expected bus 3 times and wait successively
# longer for the device to appear.
# Sometimes the bus doesn't appear until you rescan repeatedly.
# XXX Often it never appears....which is a problem
counter = 1
start_time = time.time()
# XXX This will only operate on the first available HLU bus
hlu_bus_path = _hlu_bus_paths(hlu)[0]
# /sys/class/scsi_disks/<fc_port>:0:0:<hlu>/device/block/ contains
# symlinks whose names are the device names that have been allocated eg
# sdvb.
block_device_pointers = hlu_bus_path.descendant(['device', 'block'])
# Do an early check to see if the device is already present.
if _directory_listable(block_device_pointers):
new_device = _device_paths_for_hlu_bus_path(hlu_bus_path)[0]
if _device_path_is_usable(new_device):
raise AlreadyAttachedVolume(blockdevice_id)
while True:
with open(os.devnull, 'w') as discard:
check_output(
["rescan-scsi-bus", "--luns={}".format(hlu)],
stderr=discard
)
try:
wait_for(
predicate=lambda: _directory_listable(
block_device_pointers
),
timeout=5 * counter
)
break
except Timeout:
if counter > 5:
elapsed_time = time.time() - start_time
raise Timeout(
"HLU bus did not appear. "
"Expected {}. "
"Waited {}s and performed {} scsi bus rescans.".format(
hlu_bus_path,
elapsed_time,
counter,
),
hlu_bus_path, elapsed_time, counter
)
else:
counter += 1
# Once the bus is available we can discover the device path and check
# that the device path is usable It may not be usable. For example the
# device is sometimes initially 0 size until you force a rescan:
# (echo 1 > /sys/class/scsi_disk/1:0:0:219/device/rescan)
# Nov 07 04:55:40 00009bb1a4558a12 kernel: sd 1:0:0:219: [sdup] 16777216 512-byte logical blocks: (8.58 GB/8.00 GiB)
# Nov 07 04:55:40 00009bb1a4558a12 kernel: sdup: detected capacity change from 0 to 8589934592
# XXX This will only operate on one of the resulting device paths.
# /sys/class/scsi_disk/x:x:x:HLU/device/block/sdvb for example.
new_device = _device_paths_for_hlu_bus_path(hlu_bus_path)[0]
rescan_device = hlu_bus_path.descendant(['device', 'rescan'])
counter = 1
while True:
try:
wait_for(
predicate=lambda: _device_path_is_usable(new_device),
timeout=5 * counter
)
break
except Timeout:
if counter > 5:
elapsed_time = time.time() - start_time
raise Timeout(
"Device did not appear. "
"Expected {}. "
"Waited {}s and performed {} scsi bus rescans.".format(
new_device,
elapsed_time,
counter,
),
new_device, elapsed_time, counter
)
else:
with rescan_device.open('w') as f:
f.write('1\n')
counter += 1
Message.new(
operation=u'attach_volume_output',
blockdevice_id=blockdevice_id,
attach_to=attach_to,
lun_name=lun_name,
alu=alu,
hlu=hlu,
device_path=repr(new_device)
).write()
return volume
