Current File : //lib/python3/dist-packages/sos/report/plugins/lvm2.py
# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.
from sos.report.plugins import (Plugin, IndependentPlugin, SoSPredicate,
PluginOpt)
class Lvm2(Plugin, IndependentPlugin):
short_desc = 'Logical Volume Manager 2'
plugin_name = 'lvm2'
profiles = ('storage',)
option_list = [
PluginOpt('lvmdump', default=False, desc='collect an lvmdump tarball'),
PluginOpt('lvmdump-am', default=False,
desc=('attempt to collect lvmdump with advanced options and '
'raw metadata'))
]
def do_lvmdump(self, metadata=False):
"""Collects an lvmdump in standard format with optional metadata
archives for each physical volume present.
"""
lvmdump_path = self.get_cmd_output_path(name="lvmdump", make=False)
lvmdump_cmd = "lvmdump %s -d '%s'"
lvmdump_opts = ""
if metadata:
lvmdump_opts = "-a -m"
cmd = lvmdump_cmd % (lvmdump_opts, lvmdump_path)
self.add_cmd_output(cmd, chroot=self.tmp_in_sysroot())
def setup(self):
# When running LVM2 comamnds:
# - use nolocking if supported, else locking_type 0 (no locks)
# from lvm.conf: Turn locking off by setting to 0 (dangerous:
# risks metadata corruption if LVM2 commands get run
# concurrently). This avoids the possibility of hanging lvm
# commands when another process or node holds a conflicting
# lock.
# - use metadata_read_only 1 (forbid on-disk changes). Although
# all LVM2 commands we use should be read-only, any LVM2
# command may attempt to recover on-disk data in some cases.
# This option prevents such changes, allowing safe use of
# locking_type=0.
# - use --foreign option in pvs, lvs, vgs and vgdisplay commands
# to support HA-LVM deployments
nolock = {'cmd': 'vgdisplay -h', 'output': '--nolocking'}
if bool(SoSPredicate(self, cmd_outputs=nolock)):
lvm_opts = '--config="global{metadata_read_only=1}" --nolocking'
else:
lvm_opts = '--config="global{locking_type=0 metadata_read_only=1}"'
lvm_opts_foreign = lvm_opts + ' --foreign'
self.add_cmd_output(
"vgdisplay -vv %s" % lvm_opts_foreign,
root_symlink="vgdisplay"
)
pvs_cols = 'pv_mda_free,pv_mda_size,pv_mda_count,pv_mda_used_count'
pvs_cols = pvs_cols + ',' + 'pe_start'
vgs_cols = 'vg_mda_count,vg_mda_free,vg_mda_size,vg_mda_used_count'
vgs_cols = vgs_cols + ',' + 'vg_tags,systemid'
lvs_cols = ('lv_tags,devices,lv_kernel_read_ahead,lv_read_ahead,'
'stripes,stripesize')
self.add_cmd_output([
"vgscan -vvv %s" % lvm_opts,
"pvscan -v %s" % lvm_opts,
"pvs -a -v -o +%s %s" % (pvs_cols, lvm_opts_foreign),
"vgs -v -o +%s %s" % (vgs_cols, lvm_opts_foreign),
"lvs -a -o +%s %s" % (lvs_cols, lvm_opts_foreign)
])
self.add_copy_spec("/etc/lvm")
if self.get_option('lvmdump'):
self.do_lvmdump()
elif self.get_option('lvmdump-am'):
self.do_lvmdump(metadata=True)
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