Subversion Repositories configs

# 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 = 0

    # 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.

    # preferred_names = [ ]

    # Try to avoid using undescriptive /dev/dm-N names, if present.

    preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]

    # 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'.

    # 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 = "/etc/lvm/cache"

    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 = 0

    # 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

    # 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 thin pool metadata will always

    # be placed on different PVs from the pool data.

    thin_pool_metadata_require_separate_pvs = 0

    # Specify the minimal chunk size (in KB) for thin pool volumes.

    # Use of the larger chunk size may improve perfomance 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 behavior 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 readeable 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 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.

    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 = "/var/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"

    # 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 = "mirror"

    # '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 redunancy and performance.  Changing to

    #            this setting is not advised.

    # Specify the '--type <raid10|mirror>' option to override this default

    # setting.

    raid10_segtype_default = "mirror"

    # 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).

    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 ignoreable errors and fix them later.

    #

    # thin_check_options = [ "-q" ]

    # 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

    #

    # thin_disabled_features = [ "discards", "block_size" ]

}

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

}

####################

# 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"

}