/etc/lvm/lvm.conf

# This is an example configuration file for the LVM2 system.
# It contains the default settings that would be used if there was no
# /etc/lvm/lvm.conf file.
#
# Refer to 'man lvm.conf' for further information including the file layout.
#
# To put this file in a different directory and override /etc/lvm set
# the environment variable LVM_SYSTEM_DIR before running the tools.
#
# N.B. Take care that each setting only appears once if uncommenting
# example settings in this file.

# This section allows you to set the way the configuration settings are handled.
config {

# If enabled, any LVM2 configuration mismatch is reported.
# This implies checking that the configuration key is understood
# by LVM2 and that the value of the key is of a proper type.
# If disabled, any configuration mismatch is ignored and default
# value is used instead without any warning (a message about the
# configuration key not being found is issued in verbose mode only).
checks = 1

# If enabled, any configuration mismatch aborts the LVM2 process.
abort_on_errors = 0

# Directory where LVM looks for configuration profiles.
profile_dir = "/etc/lvm/profile"
}

# This section allows you to configure which block devices should
# be used by the LVM system.
devices {

# Where do you want your volume groups to appear ?
dir = "/dev"

# An array of directories that contain the device nodes you wish
# to use with LVM2.
scan = [ "/dev" ]

# If set, the cache of block device nodes with all associated symlinks
# will be constructed out of the existing udev database content.
# This avoids using and opening any inapplicable non-block devices or
# subdirectories found in the device directory. This setting is applied
# to udev-managed device directory only, other directories will be scanned
# fully. LVM2 needs to be compiled with udev support for this setting to
# take effect. N.B. Any device node or symlink not managed by udev in
# udev directory will be ignored with this setting on.
obtain_device_list_from_udev = 1

# If several entries in the scanned directories correspond to the
# same block device and the tools need to display a name for device,
# all the pathnames are matched against each item in the following
# list of regular expressions in turn and the first match is used.

# By default no preferred names are defined.
# preferred_names = [ ]

# Try to avoid using undescriptive /dev/dm-N names, if present.
# preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]

# In case no prefererred name matches or if preferred_names are not
# defined at all, builtin rules are used to determine the preference.
#
# The first builtin rule checks path prefixes and it gives preference
# based on this ordering (where "dev" depends on devices/dev setting):
# /dev/mapper > /dev/disk > /dev/dm-* > /dev/block
#
# If the ordering above cannot be applied, the path with fewer slashes
# gets preference then.
#
# If the number of slashes is the same, a symlink gets preference.
#
# Finally, if all the rules mentioned above are not applicable,
# lexicographical order is used over paths and the smallest one
# of all gets preference.

# A filter that tells LVM2 to only use a restricted set of devices.
# The filter consists of an array of regular expressions. These
# expressions can be delimited by a character of your choice, and
# prefixed with either an 'a' (for accept) or 'r' (for reject).
# The first expression found to match a device name determines if
# the device will be accepted or rejected (ignored). Devices that
# don't match any patterns are accepted.

# Be careful if there there are symbolic links or multiple filesystem
# entries for the same device as each name is checked separately against
# the list of patterns. The effect is that if the first pattern in the
# list to match a name is an 'a' pattern for any of the names, the device
# is accepted; otherwise if the first pattern in the list to match a name
# is an 'r' pattern for any of the names it is rejected; otherwise it is
# accepted.

# Don't have more than one filter line active at once: only one gets used.

# Run vgscan after you change this parameter to ensure that
# the cache file gets regenerated (see below).
# If it doesn't do what you expect, check the output of 'vgscan -vvvv'.

# If lvmetad is used, then see "A note about device filtering while
# lvmetad is used" comment that is attached to global/use_lvmetad setting.

# By default we accept every block device:
# filter = [ "a/.*/" ]

# Exclude the cdrom drive
# filter = [ "r|/dev/cdrom|" ]

# When testing I like to work with just loopback devices:
# filter = [ "a/loop/", "r/.*/" ]

# Or maybe all loops and ide drives except hdc:
# filter =[ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]

# Use anchors if you want to be really specific
# filter = [ "a|^/dev/hda8$|", "r/.*/" ]

# Since "filter" is often overridden from command line, it is not suitable
# for system-wide device filtering (udev rules, lvmetad). To hide devices
# from LVM-specific udev processing and/or from lvmetad, you need to set
# global_filter. The syntax is the same as for normal "filter"
# above. Devices that fail the global_filter are not even opened by LVM.

# global_filter = []

# The results of the filtering are cached on disk to avoid
# rescanning dud devices (which can take a very long time).
# By default this cache is stored in the /etc/lvm/cache directory
# in a file called '.cache'.
# It is safe to delete the contents: the tools regenerate it.
# (The old setting 'cache' is still respected if neither of
# these new ones is present.)
# N.B. If obtain_device_list_from_udev is set to 1 the list of
# devices is instead obtained from udev and any existing .cache
# file is removed.
cache_dir = "/run/lvm"
cache_file_prefix = ""

# You can turn off writing this cache file by setting this to 0.
write_cache_state = 1

# Advanced settings.

# List of pairs of additional acceptable block device types found
# in /proc/devices with maximum (non-zero) number of partitions.
# types = [ "fd", 16 ]

# If sysfs is mounted (2.6 kernels) restrict device scanning to
# the block devices it believes are valid.
# 1 enables; 0 disables.
sysfs_scan = 1

# By default, LVM2 will ignore devices used as component paths
# of device-mapper multipath devices.
# 1 enables; 0 disables.
multipath_component_detection = 1

# By default, LVM2 will ignore devices used as components of
# software RAID (md) devices by looking for md superblocks.
# 1 enables; 0 disables.
md_component_detection = 1

# By default, if a PV is placed directly upon an md device, LVM2
# will align its data blocks with the md device's stripe-width.
# 1 enables; 0 disables.
md_chunk_alignment = 1

# Default alignment of the start of a data area in MB. If set to 0,
# a value of 64KB will be used. Set to 1 for 1MiB, 2 for 2MiB, etc.
# default_data_alignment = 1

# By default, the start of a PV's data area will be a multiple of
# the 'minimum_io_size' or 'optimal_io_size' exposed in sysfs.
# - minimum_io_size - the smallest request the device can perform
# w/o incurring a read-modify-write penalty (e.g. MD's chunk size)
# - optimal_io_size - the device's preferred unit of receiving I/O
# (e.g. MD's stripe width)
# minimum_io_size is used if optimal_io_size is undefined (0).
# If md_chunk_alignment is enabled, that detects the optimal_io_size.
# This setting takes precedence over md_chunk_alignment.
# 1 enables; 0 disables.
data_alignment_detection = 1

# Alignment (in KB) of start of data area when creating a new PV.
# md_chunk_alignment and data_alignment_detection are disabled if set.
# Set to 0 for the default alignment (see: data_alignment_default)
# or page size, if larger.
data_alignment = 0

# By default, the start of the PV's aligned data area will be shifted by
# the 'alignment_offset' exposed in sysfs. This offset is often 0 but
# may be non-zero; e.g.: certain 4KB sector drives that compensate for
# windows partitioning will have an alignment_offset of 3584 bytes
# (sector 7 is the lowest aligned logical block, the 4KB sectors start
# at LBA -1, and consequently sector 63 is aligned on a 4KB boundary).
# But note that pvcreate --dataalignmentoffset will skip this detection.
# 1 enables; 0 disables.
data_alignment_offset_detection = 1

# If, while scanning the system for PVs, LVM2 encounters a device-mapper
# device that has its I/O suspended, it waits for it to become accessible.
# Set this to 1 to skip such devices. This should only be needed
# in recovery situations.
ignore_suspended_devices = 0

# ignore_lvm_mirrors: Introduced in version 2.02.104
# This setting determines whether logical volumes of "mirror" segment
# type are scanned for LVM labels. This affects the ability of
# mirrors to be used as physical volumes. If 'ignore_lvm_mirrors'
# is set to '1', it becomes impossible to create volume groups on top
# of mirror logical volumes - i.e. to stack volume groups on mirrors.
#
# Allowing mirror logical volumes to be scanned (setting the value to '0')
# can potentially cause LVM processes and I/O to the mirror to become
# blocked. This is due to the way that the "mirror" segment type handles
# failures. In order for the hang to manifest itself, an LVM command must
# be run just after a failure and before the automatic LVM repair process
# takes place OR there must be failures in multiple mirrors in the same
# volume group at the same time with write failures occurring moments
# before a scan of the mirror's labels.
#
# Note that these scanning limitations do not apply to the LVM RAID
# types, like "raid1". The RAID segment types handle failures in a
# different way and are not subject to possible process or I/O blocking.
#
# It is encouraged that users set 'ignore_lvm_mirrors' to 1 if they
# are using the "mirror" segment type. Users that require volume group
# stacking on mirrored logical volumes should consider using the "raid1"
# segment type. The "raid1" segment type is not available for
# active/active clustered volume groups.
#
# Set to 1 to disallow stacking and thereby avoid a possible deadlock.
ignore_lvm_mirrors = 1

# During each LVM operation errors received from each device are counted.
# If the counter of a particular device exceeds the limit set here, no
# further I/O is sent to that device for the remainder of the respective
# operation. Setting the parameter to 0 disables the counters altogether.
disable_after_error_count = 0

# Allow use of pvcreate --uuid without requiring --restorefile.
require_restorefile_with_uuid = 1

# Minimum size (in KB) of block devices which can be used as PVs.
# In a clustered environment all nodes must use the same value.
# Any value smaller than 512KB is ignored.

# Ignore devices smaller than 2MB such as floppy drives.
pv_min_size = 2048

# The original built-in setting was 512 up to and including version 2.02.84.
# pv_min_size = 512

# Issue discards to a logical volumes's underlying physical volume(s) when
# the logical volume is no longer using the physical volumes' space (e.g.
# lvremove, lvreduce, etc). Discards inform the storage that a region is
# no longer in use. Storage that supports discards advertise the protocol
# specific way discards should be issued by the kernel (TRIM, UNMAP, or
# WRITE SAME with UNMAP bit set). Not all storage will support or benefit
# from discards but SSDs and thinly provisioned LUNs generally do. If set
# to 1, discards will only be issued if both the storage and kernel provide
# support.
# 1 enables; 0 disables.
issue_discards = 0
}

# This section allows you to configure the way in which LVM selects
# free space for its Logical Volumes.
allocation {

# When searching for free space to extend an LV, the "cling"
# allocation policy will choose space on the same PVs as the last
# segment of the existing LV. If there is insufficient space and a
# list of tags is defined here, it will check whether any of them are
# attached to the PVs concerned and then seek to match those PV tags
# between existing extents and new extents.
# Use the special tag "@*" as a wildcard to match any PV tag.

# Example: LVs are mirrored between two sites within a single VG.
# PVs are tagged with either @site1 or @site2 to indicate where
# they are situated.

# cling_tag_list = [ "@site1", "@site2" ]
# cling_tag_list = [ "@*" ]

# Changes made in version 2.02.85 extended the reach of the 'cling'
# policies to detect more situations where data can be grouped
# onto the same disks. Set this to 0 to revert to the previous
# algorithm.
maximise_cling = 1

# Whether to use blkid library instead of native LVM2 code to detect
# any existing signatures while creating new Physical Volumes and
# Logical Volumes. LVM2 needs to be compiled with blkid wiping support
# for this setting to take effect.
#
# LVM2 native detection code is currently able to recognize these signatures:
# - MD device signature
# - swap signature
# - LUKS signature
# To see the list of signatures recognized by blkid, check the output
# of 'blkid -k' command. The blkid can recognize more signatures than
# LVM2 native detection code, but due to this higher number of signatures
# to be recognized, it can take more time to complete the signature scan.
use_blkid_wiping = 1

# Set to 1 to wipe any signatures found on newly-created Logical Volumes
# automatically in addition to zeroing of the first KB on the LV
# (controlled by the -Z/--zero y option).
# The command line option -W/--wipesignatures takes precedence over this
# setting.
# The default is to wipe signatures when zeroing.
#
wipe_signatures_when_zeroing_new_lvs = 1

# Set to 1 to guarantee that mirror logs will always be placed on
# different PVs from the mirror images. This was the default
# until version 2.02.85.
mirror_logs_require_separate_pvs = 0

# Set to 1 to guarantee that cache_pool metadata will always be
# placed on different PVs from the cache_pool data.
cache_pool_metadata_require_separate_pvs = 0

# Specify the minimal chunk size (in kiB) for cache pool volumes.
# Using a chunk_size that is too large can result in wasteful use of
# the cache, where small reads and writes can cause large sections of
# an LV to be mapped into the cache. However, choosing a chunk_size
# that is too small can result in more overhead trying to manage the
# numerous chunks that become mapped into the cache. The former is
# more of a problem than the latter in most cases, so we default to
# a value that is on the smaller end of the spectrum. Supported values
# range from 32(kiB) to 1048576 in multiples of 32.
# cache_pool_chunk_size = 64

# Set to 1 to guarantee that thin pool metadata will always
# be placed on different PVs from the pool data.
thin_pool_metadata_require_separate_pvs = 0

# Specify chunk size calculation policy for thin pool volumes.
# Possible options are:
# "generic" - if thin_pool_chunk_size is defined, use it.
# Otherwise, calculate the chunk size based on
# estimation and device hints exposed in sysfs:
# the minimum_io_size. The chunk size is always
# at least 64KiB.
#
# "performance" - if thin_pool_chunk_size is defined, use it.
# Otherwise, calculate the chunk size for
# performance based on device hints exposed in
# sysfs: the optimal_io_size. The chunk size is
# always at least 512KiB.
# thin_pool_chunk_size_policy = "generic"

# Specify the minimal chunk size (in KB) for thin pool volumes.
# Use of the larger chunk size may improve performance for plain
# thin volumes, however using them for snapshot volumes is less efficient,
# as it consumes more space and takes extra time for copying.
# When unset, lvm tries to estimate chunk size starting from 64KB
# Supported values are in range from 64 to 1048576.
# thin_pool_chunk_size = 64

# Specify discards behaviour of the thin pool volume.
# Select one of "ignore", "nopassdown", "passdown"
# thin_pool_discards = "passdown"

# Set to 0, to disable zeroing of thin pool data chunks before their
# first use.
# N.B. zeroing larger thin pool chunk size degrades performance.
# thin_pool_zero = 1
}

# This section that allows you to configure the nature of the
# information that LVM2 reports.
log {

# Controls the messages sent to stdout or stderr.
# There are three levels of verbosity, 3 being the most verbose.
verbose = 0

# Set to 1 to suppress all non-essential messages from stdout.
# This has the same effect as -qq.
# When this is set, the following commands still produce output:
# dumpconfig, lvdisplay, lvmdiskscan, lvs, pvck, pvdisplay,
# pvs, version, vgcfgrestore -l, vgdisplay, vgs.
# Non-essential messages are shifted from log level 4 to log level 5
# for syslog and lvm2_log_fn purposes.
# Any 'yes' or 'no' questions not overridden by other arguments
# are suppressed and default to 'no'.
silent = 0

# Should we send log messages through syslog?
# 1 is yes; 0 is no.
syslog = 1

# Should we log error and debug messages to a file?
# By default there is no log file.
#file = "/var/log/lvm2.log"

# Should we overwrite the log file each time the program is run?
# By default we append.
overwrite = 0

# What level of log messages should we send to the log file and/or syslog?
# There are 6 syslog-like log levels currently in use - 2 to 7 inclusive.
# 7 is the most verbose (LOG_DEBUG).
level = 0

# Format of output messages
# Whether or not (1 or 0) to indent messages according to their severity
indent = 1

# Whether or not (1 or 0) to display the command name on each line output
command_names = 0

# A prefix to use before the message text (but after the command name,
# if selected). Default is two spaces, so you can see/grep the severity
# of each message.
prefix = " "

# To make the messages look similar to the original LVM tools use:
# indent = 0
# command_names = 1
# prefix = " -- "

# Set this if you want log messages during activation.
# Don't use this in low memory situations (can deadlock).
# activation = 0

# Some debugging messages are assigned to a class and only appear
# in debug output if the class is listed here.
# Classes currently available:
# memory, devices, activation, allocation, lvmetad, metadata, cache,
# locking
# Use "all" to see everything.
debug_classes = [ "memory", "devices", "activation", "allocation",
"lvmetad", "metadata", "cache", "locking" ]
}

# Configuration of metadata backups and archiving. In LVM2 when we
# talk about a 'backup' we mean making a copy of the metadata for the
# *current* system. The 'archive' contains old metadata configurations.
# Backups are stored in a human readable text format.
backup {

# Should we maintain a backup of the current metadata configuration ?
# Use 1 for Yes; 0 for No.
# Think very hard before turning this off!
backup = 1

# Where shall we keep it ?
# Remember to back up this directory regularly!
backup_dir = "/etc/lvm/backup"

# Should we maintain an archive of old metadata configurations.
# Use 1 for Yes; 0 for No.
# On by default. Think very hard before turning this off.
archive = 1

# Where should archived files go ?
# Remember to back up this directory regularly!
archive_dir = "/etc/lvm/archive"

# What is the minimum number of archive files you wish to keep ?
retain_min = 10

# What is the minimum time you wish to keep an archive file for ?
retain_days = 30
}

# Settings for the running LVM2 in shell (readline) mode.
shell {

# Number of lines of history to store in ~/.lvm_history
history_size = 100
}

# Miscellaneous global LVM2 settings
global {
# The file creation mask for any files and directories created.
# Interpreted as octal if the first digit is zero.
umask = 077

# Allow other users to read the files
#umask = 022

# Enabling test mode means that no changes to the on disk metadata
# will be made. Equivalent to having the -t option on every
# command. Defaults to off.
test = 0

# Default value for --units argument
units = "h"

# Since version 2.02.54, the tools distinguish between powers of
# 1024 bytes (e.g. KiB, MiB, GiB) and powers of 1000 bytes (e.g.
# KB, MB, GB).
# If you have scripts that depend on the old behaviour, set this to 0
# temporarily until you update them.
si_unit_consistency = 1

# Whether or not to display unit suffix for sizes. This setting has
# no effect if the units are in human-readable form (global/units="h")
# in which case the suffix is always displayed.
suffix = 1

# Whether or not to communicate with the kernel device-mapper.
# Set to 0 if you want to use the tools to manipulate LVM metadata
# without activating any logical volumes.
# If the device-mapper kernel driver is not present in your kernel
# setting this to 0 should suppress the error messages.
activation = 1

# If we can't communicate with device-mapper, should we try running
# the LVM1 tools?
# This option only applies to 2.4 kernels and is provided to help you
# switch between device-mapper kernels and LVM1 kernels.
# The LVM1 tools need to be installed with .lvm1 suffices
# e.g. vgscan.lvm1 and they will stop working after you start using
# the new lvm2 on-disk metadata format.
# The default value is set when the tools are built.
# fallback_to_lvm1 = 0

# The default metadata format that commands should use - "lvm1" or "lvm2".
# The command line override is -M1 or -M2.
# Defaults to "lvm2".
# format = "lvm2"

# Location of proc filesystem
proc = "/proc"

# Type of locking to use. Defaults to local file-based locking (1).
# Turn locking off by setting to 0 (dangerous: risks metadata corruption
# if LVM2 commands get run concurrently).
# Type 2 uses the external shared library locking_library.
# Type 3 uses built-in clustered locking.
# Type 4 uses read-only locking which forbids any operations that might
# change metadata.
# Type 5 offers dummy locking for tools that do not need any locks.
# You should not need to set this directly: the tools will select when
# to use it instead of the configured locking_type. Do not use lvmetad or
# the kernel device-mapper driver with this locking type.
# It is used by the --readonly option that offers read-only access to
# Volume Group metadata that cannot be locked safely because it belongs to
# an inaccessible domain and might be in use, for example a virtual machine
# image or a disk that is shared by a clustered machine.
#
# N.B. Don't use lvmetad with locking type 3 as lvmetad is not yet
# supported in clustered environment. If use_lvmetad=1 and locking_type=3
# is set at the same time, LVM always issues a warning message about this
# and then it automatically disables lvmetad use.
locking_type = 1

# Set to 0 to fail when a lock request cannot be satisfied immediately.
wait_for_locks = 1

# If using external locking (type 2) and initialisation fails,
# with this set to 1 an attempt will be made to use the built-in
# clustered locking.
# If you are using a customised locking_library you should set this to 0.
fallback_to_clustered_locking = 1

# If an attempt to initialise type 2 or type 3 locking failed, perhaps
# because cluster components such as clvmd are not running, with this set
# to 1 an attempt will be made to use local file-based locking (type 1).
# If this succeeds, only commands against local volume groups will proceed.
# Volume Groups marked as clustered will be ignored.
fallback_to_local_locking = 1

# Local non-LV directory that holds file-based locks while commands are
# in progress. A directory like /tmp that may get wiped on reboot is OK.
locking_dir = "/run/lock/lvm"

# Whenever there are competing read-only and read-write access requests for
# a volume group's metadata, instead of always granting the read-only
# requests immediately, delay them to allow the read-write requests to be
# serviced. Without this setting, write access may be stalled by a high
# volume of read-only requests.
# NB. This option only affects locking_type = 1 viz. local file-based
# locking.
prioritise_write_locks = 1

# Other entries can go here to allow you to load shared libraries
# e.g. if support for LVM1 metadata was compiled as a shared library use
# format_libraries = "liblvm2format1.so"
# Full pathnames can be given.

# Search this directory first for shared libraries.
# library_dir = "/lib/lvm2"

# The external locking library to load if locking_type is set to 2.
# locking_library = "liblvm2clusterlock.so"

# Treat any internal errors as fatal errors, aborting the process that
# encountered the internal error. Please only enable for debugging.
abort_on_internal_errors = 0

# Check whether CRC is matching when parsed VG is used multiple times.
# This is useful to catch unexpected internal cached volume group
# structure modification. Please only enable for debugging.
detect_internal_vg_cache_corruption = 0

# If set to 1, no operations that change on-disk metadata will be permitted.
# Additionally, read-only commands that encounter metadata in need of repair
# will still be allowed to proceed exactly as if the repair had been
# performed (except for the unchanged vg_seqno).
# Inappropriate use could mess up your system, so seek advice first!
metadata_read_only = 0

# 'mirror_segtype_default' defines which segtype will be used when the
# shorthand '-m' option is used for mirroring. The possible options are:
#
# "mirror" - The original RAID1 implementation provided by LVM2/DM. It is
# characterized by a flexible log solution (core, disk, mirrored)
# and by the necessity to block I/O while reconfiguring in the
# event of a failure.
#
# There is an inherent race in the dmeventd failure handling
# logic with snapshots of devices using this type of RAID1 that
# in the worst case could cause a deadlock.
# Ref: https://bugzilla.redhat.com/show_bug.cgi?id=817130#c10
#
# "raid1" - This implementation leverages MD's RAID1 personality through
# device-mapper. It is characterized by a lack of log options.
# (A log is always allocated for every device and they are placed
# on the same device as the image - no separate devices are
# required.) This mirror implementation does not require I/O
# to be blocked in the kernel in the event of a failure.
# This mirror implementation is not cluster-aware and cannot be
# used in a shared (active/active) fashion in a cluster.
#
# Specify the '--type <mirror|raid1>' option to override this default
# setting.
mirror_segtype_default = "raid1"

# 'raid10_segtype_default' determines the segment types used by default
# when the '--stripes/-i' and '--mirrors/-m' arguments are both specified
# during the creation of a logical volume.
# Possible settings include:
#
# "raid10" - This implementation leverages MD's RAID10 personality through
# device-mapper.
#
# "mirror" - LVM will layer the 'mirror' and 'stripe' segment types. It
# will do this by creating a mirror on top of striped sub-LVs;
# effectively creating a RAID 0+1 array. This is suboptimal
# in terms of providing redundancy and performance. Changing to
# this setting is not advised.
# Specify the '--type <raid10|mirror>' option to override this default
# setting.
raid10_segtype_default = "raid10"

# The default format for displaying LV names in lvdisplay was changed
# in version 2.02.89 to show the LV name and path separately.
# Previously this was always shown as /dev/vgname/lvname even when that
# was never a valid path in the /dev filesystem.
# Set to 1 to reinstate the previous format.
#
# lvdisplay_shows_full_device_path = 0

# Whether to use (trust) a running instance of lvmetad. If this is set to
# 0, all commands fall back to the usual scanning mechanisms. When set to 1
# *and* when lvmetad is running (automatically instantiated by making use of
# systemd's socket-based service activation or run as an initscripts service
# or run manually), the volume group metadata and PV state flags are obtained
# from the lvmetad instance and no scanning is done by the individual
# commands. In a setup with lvmetad, lvmetad udev rules *must* be set up for
# LVM to work correctly. Without proper udev rules, all changes in block
# device configuration will be *ignored* until a manual 'pvscan --cache'
# is performed. These rules are installed by default.
#
# If lvmetad has been running while use_lvmetad was 0, it MUST be stopped
# before changing use_lvmetad to 1 and started again afterwards.
#
# If using lvmetad, the volume activation is also switched to automatic
# event-based mode. In this mode, the volumes are activated based on
# incoming udev events that automatically inform lvmetad about new PVs
# that appear in the system. Once the VG is complete (all the PVs are
# present), it is auto-activated. The activation/auto_activation_volume_list
# setting controls which volumes are auto-activated (all by default).
#
# A note about device filtering while lvmetad is used:
# When lvmetad is updated (either automatically based on udev events
# or directly by pvscan --cache <device> call), the devices/filter
# is ignored and all devices are scanned by default. The lvmetad always
# keeps unfiltered information which is then provided to LVM commands
# and then each LVM command does the filtering based on devices/filter
# setting itself.
# To prevent scanning devices completely, even when using lvmetad,
# the devices/global_filter must be used.
# N.B. Don't use lvmetad with locking type 3 as lvmetad is not yet
# supported in clustered environment. If use_lvmetad=1 and locking_type=3
# is set at the same time, LVM always issues a warning message about this
# and then it automatically disables lvmetad use.
use_lvmetad = 0

# Full path of the utility called to check that a thin metadata device
# is in a state that allows it to be used.
# Each time a thin pool needs to be activated or after it is deactivated
# this utility is executed. The activation will only proceed if the utility
# has an exit status of 0.
# Set to "" to skip this check. (Not recommended.)
# The thin tools are available as part of the device-mapper-persistent-data
# package from https://github.com/jthornber/thin-provisioning-tools.
#
# thin_check_executable = "/usr/sbin/thin_check"

# Array of string options passed with thin_check command. By default,
# option "-q" is for quiet output.
# With thin_check version 2.1 or newer you can add "--ignore-non-fatal-errors"
# to let it pass through ignorable errors and fix them later.
# With thin_check version 3.2 or newer you should add
# "--clear-needs-check-flag".
#
# thin_check_options = [ "-q", "--clear-needs-check-flag" ]

# Full path of the utility called to repair a thin metadata device
# is in a state that allows it to be used.
# Each time a thin pool needs repair this utility is executed.
# See thin_check_executable how to obtain binaries.
#
# thin_repair_executable = "/usr/sbin/thin_repair"

# Array of extra string options passed with thin_repair command.
# thin_repair_options = [ "" ]

# Full path of the utility called to dump thin metadata content.
# See thin_check_executable how to obtain binaries.
#
# thin_dump_executable = "/usr/sbin/thin_dump"

# If set, given features are not used by thin driver.
# This can be helpful not just for testing, but i.e. allows to avoid
# using problematic implementation of some thin feature.
# Features:
# block_size
# discards
# discards_non_power_2
# external_origin
# metadata_resize
# external_origin_extend
#
# thin_disabled_features = [ "discards", "block_size" ]

# Full path of the utility called to check that a cache metadata device
# is in a state that allows it to be used.
# Each time a cached LV needs to be used or after it is deactivated
# this utility is executed. The activation will only proceed if the utility
# has an exit status of 0.
# Set to "" to skip this check. (Not recommended.)
# The cache tools are available as part of the device-mapper-persistent-data
# package from https://github.com/jthornber/thin-provisioning-tools.
#
# cache_check_executable = "/usr/sbin/cache_check"

# Array of string options passed with cache_check command. By default,
# option "-q" is for quiet output.
#
# cache_check_options = [ "-q" ]

# Full path of the utility called to repair a cache metadata device.
# Each time a cache metadata needs repair this utility is executed.
# See cache_check_executable how to obtain binaries.
#
# cache_repair_executable = "/usr/sbin/cache_repair"

# Array of extra string options passed with cache_repair command.
# cache_repair_options = [ "" ]

# Full path of the utility called to dump cache metadata content.
# See cache_check_executable how to obtain binaries.
#
# cache_dump_executable = "/usr/sbin/cache_dump"
}

activation {
# Set to 1 to perform internal checks on the operations issued to
# libdevmapper. Useful for debugging problems with activation.
# Some of the checks may be expensive, so it's best to use this
# only when there seems to be a problem.
checks = 0

# Set to 0 to disable udev synchronisation (if compiled into the binaries).
# Processes will not wait for notification from udev.
# They will continue irrespective of any possible udev processing
# in the background. You should only use this if udev is not running
# or has rules that ignore the devices LVM2 creates.
# The command line argument --nodevsync takes precedence over this setting.
# If set to 1 when udev is not running, and there are LVM2 processes
# waiting for udev, run 'dmsetup udevcomplete_all' manually to wake them up.
udev_sync = 1

# Set to 0 to disable the udev rules installed by LVM2 (if built with
# --enable-udev_rules). LVM2 will then manage the /dev nodes and symlinks
# for active logical volumes directly itself.
# N.B. Manual intervention may be required if this setting is changed
# while any logical volumes are active.
udev_rules = 1

# Set to 1 for LVM2 to verify operations performed by udev. This turns on
# additional checks (and if necessary, repairs) on entries in the device
# directory after udev has completed processing its events.
# Useful for diagnosing problems with LVM2/udev interactions.
verify_udev_operations = 0

# If set to 1 and if deactivation of an LV fails, perhaps because
# a process run from a quick udev rule temporarily opened the device,
# retry the operation for a few seconds before failing.
retry_deactivation = 1

# How to fill in missing stripes if activating an incomplete volume.
# Using "error" will make inaccessible parts of the device return
# I/O errors on access. You can instead use a device path, in which
# case, that device will be used to in place of missing stripes.
# But note that using anything other than "error" with mirrored
# or snapshotted volumes is likely to result in data corruption.
missing_stripe_filler = "error"

# The linear target is an optimised version of the striped target
# that only handles a single stripe. Set this to 0 to disable this
# optimisation and always use the striped target.
use_linear_target = 1

# How much stack (in KB) to reserve for use while devices suspended
# Prior to version 2.02.89 this used to be set to 256KB
reserved_stack = 64

# How much memory (in KB) to reserve for use while devices suspended
reserved_memory = 8192

# Nice value used while devices suspended
process_priority = -18

# If volume_list is defined, each LV is only activated if there is a
# match against the list.
#
# "vgname" and "vgname/lvname" are matched exactly.
# "@tag" matches any tag set in the LV or VG.
# "@*" matches if any tag defined on the host is also set in the LV or VG
#
# If any host tags exist but volume_list is not defined, a default
# single-entry list containing "@*" is assumed.
#
# volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]

# If auto_activation_volume_list is defined, each LV that is to be
# activated with the autoactivation option (--activate ay/-a ay) is
# first checked against the list. There are two scenarios in which
# the autoactivation option is used:
#
# - automatic activation of volumes based on incoming PVs. If all the
# PVs making up a VG are present in the system, the autoactivation
# is triggered. This requires lvmetad (global/use_lvmetad=1) and udev
# to be running. In this case, "pvscan --cache -aay" is called
# automatically without any user intervention while processing
# udev events. Please, make sure you define auto_activation_volume_list
# properly so only the volumes you want and expect are autoactivated.
#
# - direct activation on command line with the autoactivation option.
# In this case, the user calls "vgchange --activate ay/-a ay" or
# "lvchange --activate ay/-a ay" directly.
#
# By default, the auto_activation_volume_list is not defined and all
# volumes will be activated either automatically or by using --activate ay/-a ay.
#
# N.B. The "activation/volume_list" is still honoured in all cases so even
# if the VG/LV passes the auto_activation_volume_list, it still needs to
# pass the volume_list for it to be activated in the end.

# If auto_activation_volume_list is defined but empty, no volumes will be
# activated automatically and --activate ay/-a ay will do nothing.
#
# auto_activation_volume_list = []

# If auto_activation_volume_list is defined and it's not empty, only matching
# volumes will be activated either automatically or by using --activate ay/-a ay.
#
# "vgname" and "vgname/lvname" are matched exactly.
# "@tag" matches any tag set in the LV or VG.
# "@*" matches if any tag defined on the host is also set in the LV or VG
#
# auto_activation_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]

# If read_only_volume_list is defined, each LV that is to be activated
# is checked against the list, and if it matches, it as activated
# in read-only mode. (This overrides '--permission rw' stored in the
# metadata.)
#
# "vgname" and "vgname/lvname" are matched exactly.
# "@tag" matches any tag set in the LV or VG.
# "@*" matches if any tag defined on the host is also set in the LV or VG
#
# read_only_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]

# Each LV can have an 'activation skip' flag stored persistently against it.
# During activation, this flag is used to decide whether such an LV is skipped.
# The 'activation skip' flag can be set during LV creation and by default it
# is automatically set for thin snapshot LVs. The 'auto_set_activation_skip'
# enables or disables this automatic setting of the flag while LVs are created.
# auto_set_activation_skip = 1

# For RAID or 'mirror' segment types, 'raid_region_size' is the
# size (in KiB) of each:
# - synchronization operation when initializing
# - each copy operation when performing a 'pvmove' (using 'mirror' segtype)
# This setting has replaced 'mirror_region_size' since version 2.02.99
raid_region_size = 512

# Setting to use when there is no readahead value stored in the metadata.
#
# "none" - Disable readahead.
# "auto" - Use default value chosen by kernel.
readahead = "auto"

# 'raid_fault_policy' defines how a device failure in a RAID logical
# volume is handled. This includes logical volumes that have the following
# segment types: raid1, raid4, raid5*, and raid6*.
#
# In the event of a failure, the following policies will determine what
# actions are performed during the automated response to failures (when
# dmeventd is monitoring the RAID logical volume) and when 'lvconvert' is
# called manually with the options '--repair' and '--use-policies'.
#
# "warn" - Use the system log to warn the user that a device in the RAID
# logical volume has failed. It is left to the user to run
# 'lvconvert --repair' manually to remove or replace the failed
# device. As long as the number of failed devices does not
# exceed the redundancy of the logical volume (1 device for
# raid4/5, 2 for raid6, etc) the logical volume will remain
# usable.
#
# "allocate" - Attempt to use any extra physical volumes in the volume
# group as spares and replace faulty devices.
#
raid_fault_policy = "warn"

# 'mirror_image_fault_policy' and 'mirror_log_fault_policy' define
# how a device failure affecting a mirror (of "mirror" segment type) is
# handled. A mirror is composed of mirror images (copies) and a log.
# A disk log ensures that a mirror does not need to be re-synced
# (all copies made the same) every time a machine reboots or crashes.
#
# In the event of a failure, the specified policy will be used to determine
# what happens. This applies to automatic repairs (when the mirror is being
# monitored by dmeventd) and to manual lvconvert --repair when
# --use-policies is given.
#
# "remove" - Simply remove the faulty device and run without it. If
# the log device fails, the mirror would convert to using
# an in-memory log. This means the mirror will not
# remember its sync status across crashes/reboots and
# the entire mirror will be re-synced. If a
# mirror image fails, the mirror will convert to a
# non-mirrored device if there is only one remaining good
# copy.
#
# "allocate" - Remove the faulty device and try to allocate space on
# a new device to be a replacement for the failed device.
# Using this policy for the log is fast and maintains the
# ability to remember sync state through crashes/reboots.
# Using this policy for a mirror device is slow, as it
# requires the mirror to resynchronize the devices, but it
# will preserve the mirror characteristic of the device.
# This policy acts like "remove" if no suitable device and
# space can be allocated for the replacement.
#
# "allocate_anywhere" - Not yet implemented. Useful to place the log device
# temporarily on same physical volume as one of the mirror
# images. This policy is not recommended for mirror devices
# since it would break the redundant nature of the mirror. This
# policy acts like "remove" if no suitable device and space can
# be allocated for the replacement.

mirror_log_fault_policy = "allocate"
mirror_image_fault_policy = "remove"

# 'snapshot_autoextend_threshold' and 'snapshot_autoextend_percent' define
# how to handle automatic snapshot extension. The former defines when the
# snapshot should be extended: when its space usage exceeds this many
# percent. The latter defines how much extra space should be allocated for
# the snapshot, in percent of its current size.
#
# For example, if you set snapshot_autoextend_threshold to 70 and
# snapshot_autoextend_percent to 20, whenever a snapshot exceeds 70% usage,
# it will be extended by another 20%. For a 1G snapshot, using up 700M will
# trigger a resize to 1.2G. When the usage exceeds 840M, the snapshot will
# be extended to 1.44G, and so on.
#
# Setting snapshot_autoextend_threshold to 100 disables automatic
# extensions. The minimum value is 50 (A setting below 50 will be treated
# as 50).

snapshot_autoextend_threshold = 100
snapshot_autoextend_percent = 20

# 'thin_pool_autoextend_threshold' and 'thin_pool_autoextend_percent' define
# how to handle automatic pool extension. The former defines when the
# pool should be extended: when its space usage exceeds this many
# percent. The latter defines how much extra space should be allocated for
# the pool, in percent of its current size.
#
# For example, if you set thin_pool_autoextend_threshold to 70 and
# thin_pool_autoextend_percent to 20, whenever a pool exceeds 70% usage,
# it will be extended by another 20%. For a 1G pool, using up 700M will
# trigger a resize to 1.2G. When the usage exceeds 840M, the pool will
# be extended to 1.44G, and so on.
#
# Setting thin_pool_autoextend_threshold to 100 disables automatic
# extensions. The minimum value is 50 (A setting below 50 will be treated
# as 50).

thin_pool_autoextend_threshold = 100
thin_pool_autoextend_percent = 20

# While activating devices, I/O to devices being (re)configured is
# suspended, and as a precaution against deadlocks, LVM2 needs to pin
# any memory it is using so it is not paged out. Groups of pages that
# are known not to be accessed during activation need not be pinned
# into memory. Each string listed in this setting is compared against
# each line in /proc/self/maps, and the pages corresponding to any
# lines that match are not pinned. On some systems locale-archive was
# found to make up over 80% of the memory used by the process.
# mlock_filter = [ "locale/locale-archive", "gconv/gconv-modules.cache" ]

# Set to 1 to revert to the default behaviour prior to version 2.02.62
# which used mlockall() to pin the whole process's memory while activating
# devices.
use_mlockall = 0

# Monitoring is enabled by default when activating logical volumes.
# Set to 0 to disable monitoring or use the --ignoremonitoring option.
monitoring = 1

# When pvmove or lvconvert must wait for the kernel to finish
# synchronising or merging data, they check and report progress
# at intervals of this number of seconds. The default is 15 seconds.
# If this is set to 0 and there is only one thing to wait for, there
# are no progress reports, but the process is awoken immediately the
# operation is complete.
polling_interval = 15

# 'activation_mode' determines how Logical Volumes are activated if
# any devices are missing. Possible settings are:
#
# "complete" - Only allow activation of an LV if all of the Physical
# Volumes it uses are present. Other PVs in the Volume
# Group may be missing.
#
# "degraded" - Like "complete", but additionally RAID Logical Volumes of
# segment type raid1, raid4, raid5, radid6 and raid10 will
# be activated if there is no data loss, i.e. they have
# sufficient redundancy to present the entire addressable
# range of the Logical Volume.
#
# "partial" - Allows the activation of any Logical Volume even if
# a missing or failed PV could cause data loss with a
# portion of the Logical Volume inaccessible.
# This setting should not normally be used, but may
# sometimes assist with data recovery.
#
# This setting was introduced in LVM version 2.02.108. It corresponds
# with the '--activationmode' option for lvchange and vgchange.
activation_mode = "degraded"
}

# Report settings.
#
# report {
# Align columns on report output.
# aligned=1

# When buffered reporting is used, the report's content is appended
# incrementally to include each object being reported until the report
# is flushed to output which normally happens at the end of command
# execution. Otherwise, if buffering is not used, each object is
# reported as soon as its processing is finished.
# buffered=1

# Show headings for columns on report.
# headings=1

# A separator to use on report after each field.
# separator=" "

# A separator to use for list items when reported.
# list_item_separator=","

# Use a field name prefix for each field reported.
# prefixes=0

# Quote field values when using field name prefixes.
# quoted=1

# Output each column as a row. If set, this also implies report/prefixes=1.
# colums_as_rows=0

# Use binary values "0" or "1" instead of descriptive literal values for
# columns that have exactly two valid values to report (not counting the
# "unknown" value which denotes that the value could not be determined).
#
# binary_values_as_numeric = 0

# Comma separated list of columns to sort by when reporting 'lvm devtypes' command.
# See 'lvm devtypes -o help' for the list of possible fields.
# devtypes_sort="devtype_name"

# Comma separated list of columns to report for 'lvm devtypes' command.
# See 'lvm devtypes -o help' for the list of possible fields.
# devtypes_cols="devtype_name,devtype_max_partitions,devtype_description"

# Comma separated list of columns to report for 'lvm devtypes' command in verbose mode.
# See 'lvm devtypes -o help' for the list of possible fields.
# devtypes_cols_verbose="devtype_name,devtype_max_partitions,devtype_description"

# Comma separated list of columns to sort by when reporting 'lvs' command.
# See 'lvs -o help' for the list of possible fields.
# lvs_sort="vg_name,lv_name"

# Comma separated list of columns to report for 'lvs' command.
# See 'lvs -o help' for the list of possible fields.
# lvs_cols="lv_name,vg_name,lv_attr,lv_size,pool_lv,origin,data_percent,metadata_percent,move_pv,mirror_log,copy_percent,convert_lv"

# Comma separated list of columns to report for 'lvs' command in verbose mode.
# See 'lvs -o help' for the list of possible fields.
# lvs_cols_verbose="lv_name,vg_name,seg_count,lv_attr,lv_size,lv_major,lv_minor,lv_kernel_major,lv_kernel_minor,pool_lv,origin,data_percent,metadata_percent,move_pv,copy_percent,mirror_log,convert

# Comma separated list of columns to sort by when reporting 'vgs' command.
# See 'vgs -o help' for the list of possible fields.
# vgs_sort="vg_name"

# Comma separated list of columns to report for 'vgs' command.
# See 'vgs -o help' for the list of possible fields.
# vgs_cols="vg_name,pv_count,lv_count,snap_count,vg_attr,vg_size,vg_free"

# Comma separated list of columns to report for 'vgs' command in verbose mode.
# See 'vgs -o help' for the list of possible fields.
# vgs_cols_verbose="vg_name,vg_attr,vg_extent_size,pv_count,lv_count,snap_count,vg_size,vg_free,vg_uuid,vg_profile"

# Comma separated list of columns to sort by when reporting 'pvs' command.
# See 'pvs -o help' for the list of possible fields.
# pvs_sort="pv_name"

# Comma separated list of columns to report for 'pvs' command.
# See 'pvs -o help' for the list of possible fields.
# pvs_cols="pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free"

# Comma separated list of columns to report for 'pvs' command in verbose mode.
# See 'pvs -o help' for the list of possible fields.
# pvs_cols_verbose="pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,dev_size,pv_uuid"

# Comma separated list of columns to sort by when reporting 'lvs --segments' command.
# See 'lvs --segments -o help' for the list of possible fields.
# segs_sort="vg_name,lv_name,seg_start"

# Comma separated list of columns to report for 'lvs --segments' command.
# See 'lvs --segments -o help' for the list of possible fields.
# segs_cols="lv_name,vg_name,lv_attr,stripes,segtype,seg_size"

# Comma separated list of columns to report for 'lvs --segments' command in verbose mode.
# See 'lvs --segments -o help' for the list of possible fields.
# segs_cols_verbose="lv_name,vg_name,lv_attr,seg_start,seg_size,stripes,segtype,stripesize,chunksize"

# Comma separated list of columns to sort by when reporting 'pvs --segments' command.
# See 'pvs --segments -o help' for the list of possible fields.
# pvsegs_sort="pv_name,pvseg_start"

# Comma separated list of columns to sort by when reporting 'pvs --segments' command.
# See 'pvs --segments -o help' for the list of possible fields.
# pvsegs_cols="pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size"

# Comma separated list of columns to sort by when reporting 'pvs --segments' command in verbose mode.
# See 'pvs --segments -o help' for the list of possible fields.
# pvsegs_cols_verbose="pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size,lv_name,seg_start_pe,segtype,seg_pe_ranges"
#}

####################
# Advanced section #
####################

# Metadata settings
#
# metadata {
# Default number of copies of metadata to hold on each PV. 0, 1 or 2.
# You might want to override it from the command line with 0
# when running pvcreate on new PVs which are to be added to large VGs.

# pvmetadatacopies = 1

# Default number of copies of metadata to maintain for each VG.
# If set to a non-zero value, LVM automatically chooses which of
# the available metadata areas to use to achieve the requested
# number of copies of the VG metadata. If you set a value larger
# than the the total number of metadata areas available then
# metadata is stored in them all.
# The default value of 0 ("unmanaged") disables this automatic
# management and allows you to control which metadata areas
# are used at the individual PV level using 'pvchange
# --metadataignore y/n'.

# vgmetadatacopies = 0

# Approximate default size of on-disk metadata areas in sectors.
# You should increase this if you have large volume groups or
# you want to retain a large on-disk history of your metadata changes.

# pvmetadatasize = 255

# List of directories holding live copies of text format metadata.
# These directories must not be on logical volumes!
# It's possible to use LVM2 with a couple of directories here,
# preferably on different (non-LV) filesystems, and with no other
# on-disk metadata (pvmetadatacopies = 0). Or this can be in
# addition to on-disk metadata areas.
# The feature was originally added to simplify testing and is not
# supported under low memory situations - the machine could lock up.
#
# Never edit any files in these directories by hand unless you
# you are absolutely sure you know what you are doing! Use
# the supplied toolset to make changes (e.g. vgcfgrestore).

# dirs = [ "/etc/lvm/metadata", "/mnt/disk2/lvm/metadata2" ]
#}

# Event daemon
#
dmeventd {
# mirror_library is the library used when monitoring a mirror device.
#
# "libdevmapper-event-lvm2mirror.so" attempts to recover from
# failures. It removes failed devices from a volume group and
# reconfigures a mirror as necessary. If no mirror library is
# provided, mirrors are not monitored through dmeventd.

mirror_library = "libdevmapper-event-lvm2mirror.so"

# snapshot_library is the library used when monitoring a snapshot device.
#
# "libdevmapper-event-lvm2snapshot.so" monitors the filling of
# snapshots and emits a warning through syslog when the use of
# the snapshot exceeds 80%. The warning is repeated when 85%, 90% and
# 95% of the snapshot is filled.

snapshot_library = "libdevmapper-event-lvm2snapshot.so"

# thin_library is the library used when monitoring a thin device.
#
# "libdevmapper-event-lvm2thin.so" monitors the filling of
# pool and emits a warning through syslog when the use of
# the pool exceeds 80%. The warning is repeated when 85%, 90% and
# 95% of the pool is filled.

thin_library = "libdevmapper-event-lvm2thin.so"

# Full path of the dmeventd binary.
#
# executable = "/sbin/dmeventd"
}

lvm2 2.02.111-2.2+deb8u1 / etc / lvm / lvm.conf