Attachment 638529 Details for Bug 873227 – lvm.conf

lvm.conf

lvm.conf (text/plain), 34.51 KB, created by Xiaowei Li on 2012-11-05 12:00:57 UTC

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Creator: Xiaowei Li

Created: 2012-11-05 12:00:57 UTC

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patch

obsolete

># 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 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.
>    # 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/sdb/", "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/.*/" ]
>
>    # 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
>
>    # 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
>}
>
># 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
>
>    # 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
>}
>
># 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 = "/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"
>
>    # 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"
>
>    # 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 (it is not auto-started), 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 'vgscan' is performed.
>    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"
>
>    # String with options passed with thin_check command. By default,
>    # option '-q' is for quiet output.
>    thin_check_options = [ "-q" ]
>}
>
>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
>    #
>    # volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
>
>    # If auto_activation_volume_list is defined, each LV that is to be
>    # activated is checked against the list while using the autoactivation
>    # option (--activate ay/-a ay), and if it matches, it is activated.
>    #   "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", "@*" ]
>
>    # Size (in KB) of each copy operation when mirroring
>    mirror_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 = "/usr/sbin/dmeventd"
>}

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Attachments on bug 873227: 638528 | 638529