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NetBSD 6.1.5 - man page for lvm.conf (netbsd section 5)

LVM.CONF(5)									      LVM.CONF(5)

NAME
       lvm.conf - Configuration file for LVM2

SYNOPSIS
       /etc/lvm/lvm.conf

DESCRIPTION
       lvm.conf is loaded during the initialisation phase of lvm (8).  This file can in turn lead
       to other files being loaded - settings read in  later  override	earlier  settings.   File
       timestamps  are	checked  between  commands  and  if  any  have changed, all the files are
       reloaded.

       Use lvm dumpconfig to check what settings are in use.

SYNTAX
       This section describes the configuration file syntax.

       Whitespace is not significant unless it is within quotes.  This provides a wide choice  of
       acceptable indentation styles.  Comments begin with # and continue to the end of the line.
       They are treated as whitespace.

       Here is an informal grammar:

       file = value*
	      A configuration file consists of a set of values.

       value = section | assignment
	      A value can either be a new section, or an assignment.

       section = identifier '{' value* '}'
	      A section is groups associated values together.
	      It is denoted by a name and delimited by curly brackets.
	      e.g. backup {
			...
		   }

       assignment = identifier '=' (array | type)
	      An assignment associates a type with an identifier.
	      e.g. max_archives = 42

       array = '[' (type ',')* type ']' | '[' ']'
	      Inhomogeneous arrays are supported.
	      Elements must be separated by commas.
	      An empty array is acceptable.

       type = integer | float | string
	      integer = [0-9]*
	      float = [0-9]*.[0-9]*
	      string = '"' .* '"'

	      Strings must be enclosed in double quotes.

SECTIONS
       The sections that may be present in the file are:

       devices -- Device settings

	      dir -- Directory in which to create volume group device nodes.  Defaults to "/dev".
	      Commands also accept this as a prefix on volume group names.

	      scan  -- List of directories to scan recursively for LVM physical volumes.  Devices
	      in directories outside this hierarchy will be ignored.  Defaults to "/dev".

	      preferred_names -- List of patterns compared in turn against all the pathnames ref-
	      erencing	the same device in in the scanned directories.	The pathname that matches
	      the earliest pattern in the list is the one used in any output.  As an example,  if
	      device-mapper  multipathing  is  used,  the  following will select multipath device
	      names:
	      devices { preferred_names = [ "^/dev/mapper/mpath" ] }

	      filter -- List of patterns to apply to devices found by a scan.  Patterns are regu-
	      lar expressions delimited by any character and preceded by a (for accept) or r (for
	      reject).	The list is traversed in order, and the first regex that  matches  deter-
	      mines  if  the  device  will be accepted or rejected (ignored).  Devices that don't
	      match any patterns are accepted. If you want to reject patterns that  don't  match,
	      end  the	list  with "r/.*/".  If there are several names for the same device (e.g.
	      symbolic links in /dev), if any name matches any a pattern, the device is accepted;
	      otherwise  if  any  name	matches  any  r  pattern  it is rejected; otherwise it is
	      accepted.  As an example, to ignore /dev/cdrom you could use:
	      devices { filter=["r|cdrom|"] }

	      cache_dir -- Persistent filter cache file directory.  Defaults to "/etc/lvm/cache".

	      write_cache_state -- Set to 0 to disable the writing out of the  persistent  filter
	      cache file when lvm exits.  Defaults to 1.

	      types  --  List  of  pairs  of  additional  acceptable  block device types found in
	      /proc/devices together with maximum (non-zero) number of partitions (normally  16).
	      By  default,  LVM2  supports ide, sd, md, loop, dasd, dac960, nbd, ida, cciss, ubd,
	      ataraid, drbd, power2, i2o_block and iseries/vd.	Block devices with major  numbers
	      of  different  types  are ignored by LVM2.  Example: types = ["fd", 16].	To create
	      physical volumes on device-mapper volumes created outside LVM2,  perhaps	encrypted
	      ones  from  cryptsetup,  you'll  need types = ["device-mapper", 16].  But if you do
	      this, be careful to avoid recursion within LVM2.	The figure for number  of  parti-
	      tions is not currently used in LVM2 - and might never be.

	      sysfs_scan  (em If set to 1 and your kernel supports sysfs and it is mounted, sysfs
	      will be used as a quick way of filtering out block devices that are not present.

	      md_component_detection (em If set to 1, LVM2 will ignore devices used as components
	      of  software  RAID  (md) devices by looking for md superblocks. This doesn't always
	      work satisfactorily e.g. if  a  device  has  been  reused  without  wiping  the  md
	      superblocks first.

       log -- Default log settings

	      file  --	Location of log file.  If this entry is not present, no log file is writ-
	      ten.

	      overwrite -- Set to 1 to overwrite the log file each time a tool	is  invoked.   By
	      default tools append messages to the log file.

	      level  -- Log level (0-9) of messages to write to the file.  9 is the most verbose;
	      0 should produce no output.

	      verbose -- Default level (0-3) of messages sent to stdout or stderr.  3 is the most
	      verbose; 0 should produce the least output.

	      syslog  -- Set to 1 (the default) to send log messages through syslog.  Turn off by
	      setting to 0.  If you set to an integer greater than one, this is  used  -  unvali-
	      dated  -	as the facility.  The default is LOG_USER.  See /usr/include/sys/syslog.h
	      for safe facility values to use.	For example, LOG_LOCAL0 might be 128.

	      indent -- When set to 1 (the default) messages  are  indented  according	to  their
	      severity, two spaces per level.  Set to 0 to turn off indentation.

	      command_names  -- When set to 1, the command name is used as a prefix for each mes-
	      sage.  Default is 0 (off).

	      prefix -- Prefix used for all messages (after the command name).	 Default  is  two
	      spaces.

	      activation  --  Set to 1 to log messages while devices are suspended during activa-
	      tion.  Only set this temporarily while debugging a problem because  in  low  memory
	      situations this setting can cause your machine to lock up.

       backup -- Configuration for metadata backups.

	      archive_dir  --  Directory  used for automatic metadata archives.  Backup copies of
	      former metadata for each volume group are archived here.	Defaults to "/etc/lvm/ar-
	      chive".

	      backup_dir  -- Directory used for automatic metadata backups.  A single backup copy
	      of the current metadata  for  each  volume  group  is  stored  here.   Defaults  to
	      "/etc/lvm/backup".

	      archive  --  Whether  or not tools automatically archive existing metadata into ar-
	      chive_dir before making changes to it.  Default is 1 (automatic archives	enabled).
	      Set  to  0  to  disable.	 Disabling this might make metadata recovery difficult or
	      impossible if something goes wrong.

	      backup -- Whether or not tools make  an  automatic  backup  into	backup_dir  after
	      changing metadata.  Default is 1 (automatic backups enabled).  Set to 0 to disable.
	      Disabling this might make metadata recovery difficult or	impossible  if	something
	      goes wrong.

	      retain_min -- Minimum number of archives to keep.  Defaults to 10.

	      retain_days -- Minimum number of days to keep archive files.  Defaults to 30.

       shell -- LVM2 built-in readline shell settings

	      history_size -- Maximum number of lines of shell history to retain (default 100) in
	      $HOME/.lvm_history

       global -- Global settings

	      test -- If set to 1, run tools in test mode i.e. no changes to the on-disk metadata
	      will get made.  It's equivalent to having the -t option on every command.

	      activation -- Set to 0 to turn off all communication with the device-mapper driver.
	      Useful if you want to manipulate logical volumes while device-mapper is not present
	      in your kernel.

	      proc -- Mount point of proc filesystem.  Defaults to /proc.

	      umask  -- File creation mask for any files and directories created.  Interpreted as
	      octal if the first digit is zero.  Defaults to 077.  Use 022 to allow  other  users
	      to read the files by default.

	      format  --  The  default	value of --metadatatype used to determine which format of
	      metadata to use when creating new physical volumes and volume groups. lvm1 or lvm2.

	      fallback_to_lvm1 -- Set this to 1 if you need to be able to switch between 2.4 ker-
	      nels  using  LVM1  and  kernels  including device-mapper.  The LVM2 tools should be
	      installed as normal and the LVM1 tools should be installed with a .lvm1 suffix e.g.
	      vgscan.lvm1.   If  an  LVM2 tool is then run but unable to communicate with device-
	      mapper, it will automatically invoke the equivalent LVM1 version of the tool.  Note
	      that  for  LVM1  tools  to manipulate physical volumes and volume groups created by
	      LVM2 you must use --metadataformat lvm1 when creating them.

	      library_dir -- A directory searched for LVM2's shared libraries ahead of the places
	      dlopen (3) searches.

	      format_libraries -- A list of shared libraries to load that contain code to process
	      different formats of metadata. For example, liblvm2formatpool.so is needed to  read
	      GFS pool metadata if LVM2 was configured --with-pool=shared.

	      locking_type -- What type of locking to use.  1 is the default, which use flocks on
	      files in locking_dir (see below) to avoid conflicting LVM2 commands running concur-
	      rently  on a single machine. 0 disables locking and risks corrupting your metadata.
	      If set to 2, the tools will load the external locking_library (see below).  If  the
	      tools  were  configured  --with-cluster=internal	(the default) then 3 means to use
	      built-in cluster-wide locking.  All changes to logical volumes and their states are
	      communicated using locks.

	      locking_dir  --  The directory LVM2 places its file locks if locking_type is set to
	      1.  The default is /var/lock/lvm.

	      locking_library -- The name of the external locking library to load if locking_type
	      is  set  to  2.  The default is liblvm2clusterlock.so.  If you need to write such a
	      library, look at the lib/locking source code directory.

       tags -- Host tag settings

	      hosttags -- If set to 1, create a host tag with the machine name.  Setting this  to
	      0  does nothing, neither creating nor destroying any tag.  The machine name used is
	      the nodename as returned by uname (2).

	      Additional host tags to be set can be listed here as subsections.  The @ prefix for
	      tags is optional.  Each of these host tag subsections can contain a host_list array
	      of host names. If any one of these entries matches the machine  name  exactly  then
	      the host tag gets defined on this particular host, otherwise it doesn't.

	      After  lvm.conf  has been processed, LVM2 works through each host tag that has been
	      defined in turn, and if there is a configuration file called lvm_<host_tag>.conf it
	      attempts	to  load  it.	Any  settings  read in override settings found in earlier
	      files.  Any additional host tags defined get appended to the  search  list,  so  in
	      turn  they  can lead to further configuration files being processed.  Use lvm dump-
	      config to check the result of config file processing.

	      The following example always sets host tags tag1 and sets tag2 on machines fs1  and
	      fs2:

	      tags { tag1 { } tag2 { host_list = [ "fs1", "fs2" ] } }

	      These  options are useful if you are replicating configuration files around a clus-
	      ter.  Use of hosttags = 1 means every machine can have static and  identical  local
	      configuration  files yet use different settings and activate different logical vol-
	      umes by default.	See also volume_list below and --addtag in lvm (8).

       activation -- Settings affecting device-mapper activation

	      missing_stripe_filler -- When activating an incomplete logical  volume  in  partial
	      mode,  this  option  dictates how the missing data is replaced.  A value of "error"
	      will cause activation to create error mappings for the missing data,  meaning  that
	      read  access  to	missing portions of the volume will result in I/O errors. You can
	      instead also use a device path, and in that case this device will be used in  place
	      of  missing stripes. However, note that using anything other than "error" with mir-
	      rored or snapshotted volumes is likely to result in data corruption.  For  instruc-
	      tions on how to create a device that always returns zeros, see lvcreate (8).

	      mirror_region_size -- Unit size in KB for copy operations when mirroring.

	      readahead -- Used when there is no readahead value stored in the volume group meta-
	      data.  Set to none to disable readahead in these circumstances or auto to  use  the
	      default value chosen by the kernel.

	      reserved_memory,	reserved_stack	--  How  many KB to reserve for LVM2 to use while
	      logical volumes are suspended.  If insufficient memory is reserved  before  suspen-
	      sion, there is a risk of machine deadlock.

	      process_priority -- The nice value to use while devices are suspended.  This is set
	      to a high priority so that logical volumes are suspended	(with  I/O  generated  by
	      other  processes to those logical volumes getting queued) for the shortest possible
	      time.

	      volume_list -- This acts as a filter through which all requests to activate a logi-
	      cal  volume  on  this machine are passed.  A logical volume is only activated if it
	      matches an item in the list.  Tags must be preceded by @ and  are  checked  against
	      all  tags  defined in the logical volume and volume group metadata for a match.  @*
	      is short-hand to check every tag set on the host machine (see tags above).  Logical
	      volume  and  volume  groups  can	also  be  included in the list by name e.g. vg00,
	      vg00/lvol1.

       metadata -- Advanced metadata settings

	      pvmetadatacopies -- When creating a physical volume using the LVM2 metadata format,
	      this  is the default number of copies of metadata to store on each physical volume.
	      Currently it can be set to 0, 1 or 2.  The default is 1.	If set to 2, one copy  is
	      placed  at the beginning of the disk and the other is placed at the end.	It can be
	      overridden on the command line with --metadatacopies.  If creating a  volume  group
	      with  just  one  physical volume, it's a good idea to have 2 copies.  If creating a
	      large volume group with many physical volumes, you may decide that 3 copies of  the
	      metadata	is sufficient, i.e. setting it to 1 on three of the physical volumes, and
	      0 on the rest.  Every volume group must contain at least one physical  volume  with
	      at least 1 copy of the metadata (unless using the text files described below).  The
	      disadvantage of having lots of copies is that every time the tools access the  vol-
	      ume  group,  every copy of the metadata has to be accessed, and this slows down the
	      tools.

	      pvmetadatasize -- Approximate number of sectors to set aside for each copy  of  the
	      metadata.  Volume groups with large numbers of physical or logical volumes, or vol-
	      umes groups containing complex logical volume structures will need additional space
	      for  their metadata.  The metadata areas are treated as circular buffers, so unused
	      space becomes filled with an archive of the most recent previous	versions  of  the
	      metadata.

	      dirs  --	List  of  directories holding live copies of LVM2 metadata as text files.
	      These directories must not be on logical volumes.  It is possible to use LVM2  with
	      a couple of directories here, preferably on different (non-logical-volume) filesys-
	      tems and with no other on-disk metadata, pvmetadatacopies = 0.  Alternatively these
	      directories  can	be  in	addition to the on-disk metadata areas.  This feature was
	      created during the development of the LVM2 metadata before the new on-disk metadata
	      areas  were designed and no longer gets tested.  It is not supported under low-mem-
	      ory conditions, and it is important never to edit these metadata files  unless  you
	      fully  understand  how things work: to make changes you should always use the tools
	      as normal, or else vgcfgbackup, edit backup, vgcfgrestore.

FILES
       /etc/lvm/lvm.conf /etc/lvm/archive /etc/lvm/backup /etc/lvm/cache/.cache /var/lock/lvm

SEE ALSO
       lvm(8), umask(2), uname(2), dlopen(3), syslog(3), syslog.conf(5)

Sistina Software UK		 LVM TOOLS 2.02.44-cvs (02-17-09)		      LVM.CONF(5)


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