openstack/os-brick
Code Issues Proposed changes
d01d65ba6e
os-brick/os_brick/local_dev/lvm.py
Thomas Bechtold 925f435cb9 Revert "Don't use ignoreskipactivation for thin LVM" 
Commit b82ab0d1a0 wrongly assumed that
the "ignoreskipactivation" flag is not needed when using thin LVM
provisioning. This is wrong.
Using thin LVM leads now to an error when the content will be copied:

ERROR cinder.volume.manager Command: sudo cinder-rootwrap /etc/cinder/
      rootwrap.conf dd if=/dev/mapper/cinder--volumes-_snapshot--UUID
      of=/dev/mapper/cinder--volumes-volume--UUID
      count=1073741824 bs=1M iflag=count_bytes conv=sparse

The reason is that the the snapshot is not activated and due to that,
no device node is available under /dev/mapper .

This reverts commit b82ab0d1a0 and makes
thin provisioning for LVM working again.

Change-Id: I062fd7d7120081c79c714d8177104cdd95522d2d
Depends-On: I788b297af92e11063b18c05a415b6f4d4d4bcd2c
Closes-Bug: #1702322
Related-Bug: #1701545
2017-07-05 13:16:38 +00:00

830 lines
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# Copyright 2013 OpenStack Foundation.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
LVM class for performing LVM operations.
"""
import math
import os
import re
from os_brick import exception
from os_brick import executor
from os_brick.privileged import rootwrap as priv_rootwrap
from os_brick import utils
from oslo_concurrency import processutils as putils
from oslo_log import log as logging
from oslo_utils import excutils
from six import moves
LOG = logging.getLogger(__name__)
class LVM(executor.Executor):
"""LVM object to enable various LVM related operations."""
LVM_CMD_PREFIX = ['env', 'LC_ALL=C']
def __init__(self, vg_name, root_helper, create_vg=False,
physical_volumes=None, lvm_type='default',
executor=None, lvm_conf=None):
"""Initialize the LVM object.
The LVM object is based on an LVM VolumeGroup, one instantiation
for each VolumeGroup you have/use.
:param vg_name: Name of existing VG or VG to create
:param root_helper: Execution root_helper method to use
:param create_vg: Indicates the VG doesn't exist
and we want to create it
:param physical_volumes: List of PVs to build VG on
:param lvm_type: VG and Volume type (default, or thin)
:param executor: Execute method to use, None uses
oslo_concurrency.processutils
"""
super(LVM, self).__init__(execute=executor, root_helper=root_helper)
self.vg_name = vg_name
self.pv_list = []
self.vg_size = 0.0
self.vg_free_space = 0.0
self.vg_lv_count = 0
self.vg_uuid = None
self.vg_thin_pool = None
self.vg_thin_pool_size = 0.0
self.vg_thin_pool_free_space = 0.0
self._supports_snapshot_lv_activation = None
self._supports_lvchange_ignoreskipactivation = None
self.vg_provisioned_capacity = 0.0
# Ensure LVM_SYSTEM_DIR has been added to LVM.LVM_CMD_PREFIX
# before the first LVM command is executed, and use the directory
# where the specified lvm_conf file is located as the value.
if lvm_conf and os.path.isfile(lvm_conf):
lvm_sys_dir = os.path.dirname(lvm_conf)
LVM.LVM_CMD_PREFIX = ['env',
'LC_ALL=C',
'LVM_SYSTEM_DIR=' + lvm_sys_dir]
if create_vg and physical_volumes is not None:
self.pv_list = physical_volumes
try:
self._create_vg(physical_volumes)
except putils.ProcessExecutionError as err:
LOG.exception('Error creating Volume Group')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise exception.VolumeGroupCreationFailed(vg_name=self.vg_name)
if self._vg_exists() is False:
LOG.error('Unable to locate Volume Group %s', vg_name)
raise exception.VolumeGroupNotFound(vg_name=vg_name)
# NOTE: we assume that the VG has been activated outside of Cinder
if lvm_type == 'thin':
pool_name = "%s-pool" % self.vg_name
if self.get_volume(pool_name) is None:
try:
self.create_thin_pool(pool_name)
except putils.ProcessExecutionError:
# Maybe we just lost the race against another copy of
# this driver being in init in parallel - e.g.
# cinder-volume and cinder-backup starting in parallel
if self.get_volume(pool_name) is None:
raise
self.vg_thin_pool = pool_name
self.activate_lv(self.vg_thin_pool)
self.pv_list = self.get_all_physical_volumes(root_helper, vg_name)
def _vg_exists(self):
"""Simple check to see if VG exists.
:returns: True if vg specified in object exists, else False
"""
exists = False
cmd = LVM.LVM_CMD_PREFIX + ['vgs', '--noheadings',
'-o', 'name', self.vg_name]
(out, _err) = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
if out is not None:
volume_groups = out.split()
if self.vg_name in volume_groups:
exists = True
return exists
def _create_vg(self, pv_list):
cmd = ['vgcreate', self.vg_name, ','.join(pv_list)]
self._execute(*cmd, root_helper=self._root_helper, run_as_root=True)
def _get_vg_uuid(self):
cmd = LVM.LVM_CMD_PREFIX + ['vgs', '--noheadings',
'-o', 'uuid', self.vg_name]
(out, _err) = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
if out is not None:
return out.split()
else:
return []
def _get_thin_pool_free_space(self, vg_name, thin_pool_name):
"""Returns available thin pool free space.
:param vg_name: the vg where the pool is placed
:param thin_pool_name: the thin pool to gather info for
:returns: Free space in GB (float), calculated using data_percent
"""
cmd = LVM.LVM_CMD_PREFIX + ['lvs', '--noheadings', '--unit=g',
'-o', 'size,data_percent', '--separator',
':', '--nosuffix']
# NOTE(gfidente): data_percent only applies to some types of LV so we
# make sure to append the actual thin pool name
cmd.append("/dev/%s/%s" % (vg_name, thin_pool_name))
free_space = 0.0
try:
(out, err) = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
if out is not None:
out = out.strip()
data = out.split(':')
pool_size = float(data[0])
data_percent = float(data[1])
consumed_space = pool_size / 100 * data_percent
free_space = pool_size - consumed_space
free_space = round(free_space, 2)
except putils.ProcessExecutionError as err:
LOG.exception('Error querying thin pool about data_percent')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
return free_space
@staticmethod
def get_lvm_version(root_helper):
"""Static method to get LVM version from system.
:param root_helper: root_helper to use for execute
:returns: version 3-tuple
"""
cmd = LVM.LVM_CMD_PREFIX + ['vgs', '--version']
(out, _err) = priv_rootwrap.execute(*cmd,
root_helper=root_helper,
run_as_root=True)
lines = out.split('\n')
for line in lines:
if 'LVM version' in line:
version_list = line.split()
# NOTE(gfidente): version is formatted as follows:
# major.minor.patchlevel(library API version)[-customisation]
version = version_list[2]
version_filter = r"(\d+)\.(\d+)\.(\d+).*"
r = re.search(version_filter, version)
version_tuple = tuple(map(int, r.group(1, 2, 3)))
return version_tuple
@staticmethod
def supports_thin_provisioning(root_helper):
"""Static method to check for thin LVM support on a system.
:param root_helper: root_helper to use for execute
:returns: True if supported, False otherwise
"""
return LVM.get_lvm_version(root_helper) >= (2, 2, 95)
@property
def supports_snapshot_lv_activation(self):
"""Property indicating whether snap activation changes are supported.
Check for LVM version >= 2.02.91.
(LVM2 git: e8a40f6 Allow to activate snapshot)
:returns: True/False indicating support
"""
if self._supports_snapshot_lv_activation is not None:
return self._supports_snapshot_lv_activation
self._supports_snapshot_lv_activation = (
self.get_lvm_version(self._root_helper) >= (2, 2, 91))
return self._supports_snapshot_lv_activation
@property
def supports_lvchange_ignoreskipactivation(self):
"""Property indicating whether lvchange can ignore skip activation.
Check for LVM version >= 2.02.99.
(LVM2 git: ab789c1bc add --ignoreactivationskip to lvchange)
"""
if self._supports_lvchange_ignoreskipactivation is not None:
return self._supports_lvchange_ignoreskipactivation
self._supports_lvchange_ignoreskipactivation = (
self.get_lvm_version(self._root_helper) >= (2, 2, 99))
return self._supports_lvchange_ignoreskipactivation
@property
def supports_full_pool_create(self):
"""Property indicating whether 100% pool creation is supported.
Check for LVM version >= 2.02.115.
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=998347
"""
if self.get_lvm_version(self._root_helper) >= (2, 2, 115):
return True
else:
return False
@staticmethod
def get_lv_info(root_helper, vg_name=None, lv_name=None):
"""Retrieve info about LVs (all, in a VG, or a single LV).
:param root_helper: root_helper to use for execute
:param vg_name: optional, gathers info for only the specified VG
:param lv_name: optional, gathers info for only the specified LV
:returns: List of Dictionaries with LV info
"""
cmd = LVM.LVM_CMD_PREFIX + ['lvs', '--noheadings', '--unit=g',
'-o', 'vg_name,name,size', '--nosuffix']
if lv_name is not None and vg_name is not None:
cmd.append("%s/%s" % (vg_name, lv_name))
elif vg_name is not None:
cmd.append(vg_name)
try:
(out, _err) = priv_rootwrap.execute(*cmd,
root_helper=root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
with excutils.save_and_reraise_exception(reraise=True) as ctx:
if "not found" in err.stderr or "Failed to find" in err.stderr:
ctx.reraise = False
LOG.info("Logical Volume not found when querying "
"LVM info. (vg_name=%(vg)s, lv_name=%(lv)s",
{'vg': vg_name, 'lv': lv_name})
out = None
lv_list = []
if out is not None:
volumes = out.split()
iterator = moves.zip(*[iter(volumes)] * 3) # pylint: disable=E1101
for vg, name, size in iterator:
lv_list.append({"vg": vg, "name": name, "size": size})
return lv_list
def get_volumes(self, lv_name=None):
"""Get all LV's associated with this instantiation (VG).
:returns: List of Dictionaries with LV info
"""
return self.get_lv_info(self._root_helper,
self.vg_name,
lv_name)
def get_volume(self, name):
"""Get reference object of volume specified by name.
:returns: dict representation of Logical Volume if exists
"""
ref_list = self.get_volumes(name)
for r in ref_list:
if r['name'] == name:
return r
return None
@staticmethod
def get_all_physical_volumes(root_helper, vg_name=None):
"""Static method to get all PVs on a system.
:param root_helper: root_helper to use for execute
:param vg_name: optional, gathers info for only the specified VG
:returns: List of Dictionaries with PV info
"""
field_sep = '|'
cmd = LVM.LVM_CMD_PREFIX + ['pvs', '--noheadings',
'--unit=g',
'-o', 'vg_name,name,size,free',
'--separator', field_sep,
'--nosuffix']
(out, _err) = priv_rootwrap.execute(*cmd,
root_helper=root_helper,
run_as_root=True)
pvs = out.split()
if vg_name is not None:
pvs = [pv for pv in pvs if vg_name == pv.split(field_sep)[0]]
pv_list = []
for pv in pvs:
fields = pv.split(field_sep)
pv_list.append({'vg': fields[0],
'name': fields[1],
'size': float(fields[2]),
'available': float(fields[3])})
return pv_list
def get_physical_volumes(self):
"""Get all PVs associated with this instantiation (VG).
:returns: List of Dictionaries with PV info
"""
self.pv_list = self.get_all_physical_volumes(self._root_helper,
self.vg_name)
return self.pv_list
@staticmethod
def get_all_volume_groups(root_helper, vg_name=None):
"""Static method to get all VGs on a system.
:param root_helper: root_helper to use for execute
:param vg_name: optional, gathers info for only the specified VG
:returns: List of Dictionaries with VG info
"""
cmd = LVM.LVM_CMD_PREFIX + ['vgs', '--noheadings',
'--unit=g', '-o',
'name,size,free,lv_count,uuid',
'--separator', ':',
'--nosuffix']
if vg_name is not None:
cmd.append(vg_name)
(out, _err) = priv_rootwrap.execute(*cmd,
root_helper=root_helper,
run_as_root=True)
vg_list = []
if out is not None:
vgs = out.split()
for vg in vgs:
fields = vg.split(':')
vg_list.append({'name': fields[0],
'size': float(fields[1]),
'available': float(fields[2]),
'lv_count': int(fields[3]),
'uuid': fields[4]})
return vg_list
def update_volume_group_info(self):
"""Update VG info for this instantiation.
Used to update member fields of object and
provide a dict of info for caller.
:returns: Dictionaries of VG info
"""
vg_list = self.get_all_volume_groups(self._root_helper, self.vg_name)
if len(vg_list) != 1:
LOG.error('Unable to find VG: %s', self.vg_name)
raise exception.VolumeGroupNotFound(vg_name=self.vg_name)
self.vg_size = float(vg_list[0]['size'])
self.vg_free_space = float(vg_list[0]['available'])
self.vg_lv_count = int(vg_list[0]['lv_count'])
self.vg_uuid = vg_list[0]['uuid']
total_vols_size = 0.0
if self.vg_thin_pool is not None:
# NOTE(xyang): If providing only self.vg_name,
# get_lv_info will output info on the thin pool and all
# individual volumes.
# get_lv_info(self._root_helper, 'stack-vg')
# sudo lvs --noheadings --unit=g -o vg_name,name,size
# --nosuffix stack-vg
# stack-vg stack-pool 9.51
# stack-vg volume-13380d16-54c3-4979-9d22-172082dbc1a1 1.00
# stack-vg volume-629e13ab-7759-46a5-b155-ee1eb20ca892 1.00
# stack-vg volume-e3e6281c-51ee-464c-b1a7-db6c0854622c 1.00
#
# If providing both self.vg_name and self.vg_thin_pool,
# get_lv_info will output only info on the thin pool, but not
# individual volumes.
# get_lv_info(self._root_helper, 'stack-vg', 'stack-pool')
# sudo lvs --noheadings --unit=g -o vg_name,name,size
# --nosuffix stack-vg/stack-pool
# stack-vg stack-pool 9.51
#
# We need info on both the thin pool and the volumes,
# therefore we should provide only self.vg_name, but not
# self.vg_thin_pool here.
for lv in self.get_lv_info(self._root_helper,
self.vg_name):
lvsize = lv['size']
# get_lv_info runs "lvs" command with "--nosuffix".
# This removes "g" from "1.00g" and only outputs "1.00".
# Running "lvs" command without "--nosuffix" will output
# "1.00g" if "g" is the unit.
# Remove the unit if it is in lv['size'].
if not lv['size'][-1].isdigit():
lvsize = lvsize[:-1]
if lv['name'] == self.vg_thin_pool:
self.vg_thin_pool_size = lvsize
tpfs = self._get_thin_pool_free_space(self.vg_name,
self.vg_thin_pool)
self.vg_thin_pool_free_space = tpfs
else:
total_vols_size = total_vols_size + float(lvsize)
total_vols_size = round(total_vols_size, 2)
self.vg_provisioned_capacity = total_vols_size
def _calculate_thin_pool_size(self):
"""Calculates the correct size for a thin pool.
Ideally we would use 100% of the containing volume group and be done.
But the 100%VG notation to lvcreate is not implemented and thus cannot
be used. See https://bugzilla.redhat.com/show_bug.cgi?id=998347
Further, some amount of free space must remain in the volume group for
metadata for the contained logical volumes. The exact amount depends
on how much volume sharing you expect.
:returns: An lvcreate-ready string for the number of calculated bytes.
"""
# make sure volume group information is current
self.update_volume_group_info()
if LVM.supports_full_pool_create:
return ["-l", "100%FREE"]
# leave 5% free for metadata
return ["-L", "%sg" % (self.vg_free_space * 0.95)]
def create_thin_pool(self, name=None):
"""Creates a thin provisioning pool for this VG.
The syntax here is slightly different than the default
lvcreate -T, so we'll just write a custom cmd here
and do it.
:param name: Name to use for pool, default is "<vg-name>-pool"
:returns: The size string passed to the lvcreate command
"""
if not LVM.supports_thin_provisioning(self._root_helper):
LOG.error('Requested to setup thin provisioning, '
'however current LVM version does not '
'support it.')
return None
if name is None:
name = '%s-pool' % self.vg_name
vg_pool_name = '%s/%s' % (self.vg_name, name)
size_args = self._calculate_thin_pool_size()
cmd = LVM.LVM_CMD_PREFIX + ['lvcreate', '-T']
cmd.extend(size_args)
cmd.append(vg_pool_name)
LOG.debug("Creating thin pool '%(pool)s' with size %(size)s of "
"total %(free)sg", {'pool': vg_pool_name,
'size': size_args,
'free': self.vg_free_space})
self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
self.vg_thin_pool = name
return
def create_volume(self, name, size_str, lv_type='default', mirror_count=0):
"""Creates a logical volume on the object's VG.
:param name: Name to use when creating Logical Volume
:param size_str: Size to use when creating Logical Volume
:param lv_type: Type of Volume (default or thin)
:param mirror_count: Use LVM mirroring with specified count
"""
if lv_type == 'thin':
pool_path = '%s/%s' % (self.vg_name, self.vg_thin_pool)
cmd = LVM.LVM_CMD_PREFIX + ['lvcreate', '-T', '-V', size_str, '-n',
name, pool_path]
else:
cmd = LVM.LVM_CMD_PREFIX + ['lvcreate', '-n', name, self.vg_name,
'-L', size_str]
if mirror_count > 0:
cmd.extend(['-m', mirror_count, '--nosync',
'--mirrorlog', 'mirrored'])
terras = int(size_str[:-1]) / 1024.0
if terras >= 1.5:
rsize = int(2 ** math.ceil(math.log(terras) / math.log(2)))
# NOTE(vish): Next power of two for region size. See:
# http://red.ht/U2BPOD
cmd.extend(['-R', str(rsize)])
try:
self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error creating Volume')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
@utils.retry(putils.ProcessExecutionError)
def create_lv_snapshot(self, name, source_lv_name, lv_type='default'):
"""Creates a snapshot of a logical volume.
:param name: Name to assign to new snapshot
:param source_lv_name: Name of Logical Volume to snapshot
:param lv_type: Type of LV (default or thin)
"""
source_lvref = self.get_volume(source_lv_name)
if source_lvref is None:
LOG.error("Trying to create snapshot by non-existent LV: %s",
source_lv_name)
raise exception.VolumeDeviceNotFound(device=source_lv_name)
cmd = LVM.LVM_CMD_PREFIX + ['lvcreate', '--name', name, '--snapshot',
'%s/%s' % (self.vg_name, source_lv_name)]
if lv_type != 'thin':
size = source_lvref['size']
cmd.extend(['-L', '%sg' % (size)])
try:
self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error creating snapshot')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
def _mangle_lv_name(self, name):
# Linux LVM reserves name that starts with snapshot, so that
# such volume name can't be created. Mangle it.
if not name.startswith('snapshot'):
return name
return '_' + name
def _lv_is_active(self, name):
cmd = LVM.LVM_CMD_PREFIX + ['lvdisplay', '--noheading', '-C', '-o',
'Attr', '%s/%s' % (self.vg_name, name)]
out, _err = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
if out:
out = out.strip()
# An example output might be '-wi-a----'; the 4th index specifies
# the status of the volume. 'a' for active, '-' for inactive.
if (out[4] == 'a'):
return True
return False
def deactivate_lv(self, name):
lv_path = self.vg_name + '/' + self._mangle_lv_name(name)
cmd = ['lvchange', '-a', 'n']
cmd.append(lv_path)
try:
self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error deactivating LV')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
# Wait until lv is deactivated to return in
# order to prevent a race condition.
self._wait_for_volume_deactivation(name)
@utils.retry(exceptions=exception.VolumeNotDeactivated, retries=3,
backoff_rate=1)
def _wait_for_volume_deactivation(self, name):
LOG.debug("Checking to see if volume %s has been deactivated.",
name)
if self._lv_is_active(name):
LOG.debug("Volume %s is still active.", name)
raise exception.VolumeNotDeactivated(name=name)
else:
LOG.debug("Volume %s has been deactivated.", name)
def activate_lv(self, name, is_snapshot=False, permanent=False):
"""Ensure that logical volume/snapshot logical volume is activated.
:param name: Name of LV to activate
:param is_snapshot: whether LV is a snapshot
:param permanent: whether we should drop skipactivation flag
:raises: putils.ProcessExecutionError
"""
# This is a no-op if requested for a snapshot on a version
# of LVM that doesn't support snapshot activation.
# (Assume snapshot LV is always active.)
if is_snapshot and not self.supports_snapshot_lv_activation:
return
lv_path = self.vg_name + '/' + self._mangle_lv_name(name)
# Must pass --yes to activate both the snap LV and its origin LV.
# Otherwise lvchange asks if you would like to do this interactively,
# and fails.
cmd = ['lvchange', '-a', 'y', '--yes']
if self.supports_lvchange_ignoreskipactivation:
cmd.append('-K')
# If permanent=True is specified, drop the skipactivation flag in
# order to make this LV automatically activated after next reboot.
if permanent:
cmd += ['-k', 'n']
cmd.append(lv_path)
try:
self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error activating LV')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
@utils.retry(putils.ProcessExecutionError)
def delete(self, name):
"""Delete logical volume or snapshot.
:param name: Name of LV to delete
"""
def run_udevadm_settle():
self._execute('udevadm', 'settle',
root_helper=self._root_helper, run_as_root=True,
check_exit_code=False)
# LV removal seems to be a race with other writers or udev in
# some cases (see LP #1270192), so we enable retry deactivation
LVM_CONFIG = 'activation { retry_deactivation = 1} '
try:
self._execute(
'lvremove',
'--config', LVM_CONFIG,
'-f',
'%s/%s' % (self.vg_name, name),
root_helper=self._root_helper, run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.debug('Error reported running lvremove: CMD: %(command)s, '
'RESPONSE: %(response)s',
{'command': err.cmd, 'response': err.stderr})
LOG.debug('Attempting udev settle and retry of lvremove...')
run_udevadm_settle()
# The previous failing lvremove -f might leave behind
# suspended devices; when lvmetad is not available, any
# further lvm command will block forever.
# Therefore we need to skip suspended devices on retry.
LVM_CONFIG += 'devices { ignore_suspended_devices = 1}'
self._execute(
'lvremove',
'--config', LVM_CONFIG,
'-f',
'%s/%s' % (self.vg_name, name),
root_helper=self._root_helper, run_as_root=True)
LOG.debug('Successfully deleted volume: %s after '
'udev settle.', name)
def revert(self, snapshot_name):
"""Revert an LV from snapshot.
:param snapshot_name: Name of snapshot to revert
"""
self._execute('lvconvert', '--merge',
snapshot_name, root_helper=self._root_helper,
run_as_root=True)
def lv_has_snapshot(self, name):
cmd = LVM.LVM_CMD_PREFIX + ['lvdisplay', '--noheading', '-C', '-o',
'Attr', '%s/%s' % (self.vg_name, name)]
out, _err = self._execute(*cmd,
root_helper=self._root_helper,
run_as_root=True)
if out:
out = out.strip()
if (out[0] == 'o') or (out[0] == 'O'):
return True
return False
def extend_volume(self, lv_name, new_size):
"""Extend the size of an existing volume."""
# Volumes with snaps have attributes 'o' or 'O' and will be
# deactivated, but Thin Volumes with snaps have attribute 'V'
# and won't be deactivated because the lv_has_snapshot method looks
# for 'o' or 'O'
if self.lv_has_snapshot(lv_name):
self.deactivate_lv(lv_name)
try:
cmd = LVM.LVM_CMD_PREFIX + ['lvextend', '-L', new_size,
'%s/%s' % (self.vg_name, lv_name)]
self._execute(*cmd, root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error extending Volume')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
def vg_mirror_free_space(self, mirror_count):
free_capacity = 0.0
disks = []
for pv in self.pv_list:
disks.append(float(pv['available']))
while True:
disks = sorted([a for a in disks if a > 0.0], reverse=True)
if len(disks) <= mirror_count:
break
# consume the smallest disk
disk = disks[-1]
disks = disks[:-1]
# match extents for each mirror on the largest disks
for index in list(range(mirror_count)):
disks[index] -= disk
free_capacity += disk
return free_capacity
def vg_mirror_size(self, mirror_count):
return (self.vg_free_space / (mirror_count + 1))
def rename_volume(self, lv_name, new_name):
"""Change the name of an existing volume."""
try:
self._execute('lvrename', self.vg_name, lv_name, new_name,
root_helper=self._root_helper,
run_as_root=True)
except putils.ProcessExecutionError as err:
LOG.exception('Error renaming logical volume')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
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