Provided by: lvm2_2.02.66-4ubuntu7_i386 bug


       lvm - LVM2 tools


       lvm [command | file]


       lvm  provides  the command-line tools for LVM2.  A separate manual page
       describes each command in detail.

       If lvm is invoked with no  arguments  it  presents  a  readline  prompt
       (assuming  it was compiled with readline support).  LVM commands may be
       entered interactively at this prompt with readline facilities including
       history  and  command name and option completion.  Refer to readline(3)
       for details.

       If lvm is invoked with argv[0] set  to  the  name  of  a  specific  LVM
       command  (for  example  by  using  a hard or soft link) it acts as that

       On invocation, lvm requires that only  the  standard  file  descriptors
       stdin,  stdout and stderr are available.  If others are found, they get
       closed and messages are issued warning about the leak.

       Where commands take VG or LV names as arguments, the full path name  is
       optional.   An  LV called "lvol0" in a VG called "vg0" can be specified
       as "vg0/lvol0".  Where a list of VGs is required but is left  empty,  a
       list  of  all VGs will be substituted.  Where a list of LVs is required
       but a VG is  given,  a  list  of  all  the  LVs  in  that  VG  will  be
       substituted.   So  "lvdisplay  vg0"  will display all the LVs in "vg0".
       Tags can also be used - see addtag below.

       One advantage  of  using  the  built-in  shell  is  that  configuration
       information gets cached internally between commands.

       A file containing a simple script with one command per line can also be
       given on the command line.  The script can also be executed directly if
       the first line is #! followed by the absolute path of lvm.


       The  following commands are built into lvm without links normally being
       created in the filesystem for them.

       dumpconfig — Display the configuration information after
              loading lvm.conf (5) and any other configuration files.

       formats — Display recognised metadata formats.

       help — Display the help text.

       pvdata — Not implemented in LVM2.

       segtypes — Display recognised logical volume segment types.

       version — Display version information.


       The following commands implement the core LVM functionality.

       pvchange — Change attributes of a physical volume.

       pvck — Check physical volume metadata.

       pvcreate — Initialize a disk or partition for use by LVM.

       pvdisplay — Display attributes of a physical volume.

       pvmove — Move physical extents.

       pvremove — Remove a physical volume.

       pvresize — Resize a disk or partition in use by LVM2.

       pvs — Report information about physical volumes.

       pvscan — Scan all disks for physical volumes.

       vgcfgbackup — Backup volume group descriptor area.

       vgcfgrestore — Restore volume group descriptor area.

       vgchange — Change attributes of a volume group.

       vgck — Check volume group metadata.

       vgconvert — Convert volume group metadata format.

       vgcreate — Create a volume group.

       vgdisplay — Display attributes of volume groups.

       vgexport — Make volume groups unknown to the system.

       vgextend — Add physical volumes to a volume group.

       vgimport — Make exported volume groups known to the system.

       vgimportclone — Import and  rename  duplicated  volume  group  (e.g.  a
       hardware snapshot).

       vgmerge — Merge two volume groups.

       vgmknodes  — Recreate volume group directory and logical volume special

       vgreduce — Reduce a volume group  by  removing  one  or  more  physical

       vgremove — Remove a volume group.

       vgrename — Rename a volume group.

       vgs — Report information about volume groups.

       vgscan — Scan all disks for volume groups and rebuild caches.

       vgsplit  —  Split  a  volume group into two, moving any logical volumes
       from one volume group to another by moving entire physical volumes.

       lvchange — Change attributes of a logical volume.

       lvconvert — Convert a logical volume from linear to mirror or snapshot.

       lvcreate — Create a logical volume in an existing volume group.

       lvdisplay — Display attributes of a logical volume.

       lvextend — Extend the size of a logical volume.

       lvmchange — Change attributes of the logical volume manager.

       lvmdiskscan — Scan for all devices visible to LVM2.

       lvmdump — Create lvm2 information dumps for diagnostic purposes.

       lvreduce — Reduce the size of a logical volume.

       lvremove — Remove a logical volume.

       lvrename — Rename a logical volume.

       lvresize — Resize a logical volume.

       lvs — Report information about logical volumes.

       lvscan — Scan (all disks) for logical volumes.

       The following commands are not implemented in LVM2 but might be in  the
       future: lvmsadc, lvmsar, pvdata.


       The following options are available for many of the commands.  They are
       implemented generically and documented here  rather  than  repeated  on
       individual manual pages.

       -h | --help — Display the help text.

       --version — Display version information.

       -v | --verbose — Set verbose level.
              Repeat from 1 to 3 times to increase the detail of messages sent
              to stdout and stderr.  Overrides config file setting.

       -d | --debug — Set debug level.
              Repeat from 1 to 6 times to increase the detail of messages sent
              to the log file and/or syslog (if configured).  Overrides config
              file setting.

       --quiet — Suppress output and log messages.
              Overrides -d and -v.

       -t | --test — Run in test mode.
              Commands will not  update  metadata.   This  is  implemented  by
              disabling   all  metadata  writing  but  nevertheless  returning
              success to the calling function.  This may lead to unusual error
              messages  in  multi-stage operations if a tool relies on reading
              back metadata it believes has changed but hasn't.

       --driverloaded { y | n }
              Whether or not the device-mapper kernel driver  is  loaded.   If
              you  set  this  to  n,  no  attempt  will be made to contact the

       -A | --autobackup { y | n }
              Whether or not to metadata should  be  backed  up  automatically
              after  a  change.  You are strongly advised not to disable this!
              See vgcfgbackup (8).

       -P | --partial
              When set, the tools will do their  best  to  provide  access  to
              volume  groups  that  are  only partially available (one or more
              physical volumes belonging to the volume group are missing  from
              the  system).   Where  part  of  a  logical  volume  is missing,
              /dev/ioerror will be substituted, and you could use dmsetup  (8)
              to  set this up to return I/O errors when accessed, or create it
              as a large block device of nulls.  Metadata may not  be  changed
              with this option. To insert a replacement physical volume of the
              same or large size use pvcreate -u to set the uuid to match  the
              original followed by vgcfgrestore (8).

       -M | --metadatatype type
              Specifies which type of on-disk metadata to use, such as lvm1 or
              lvm2, which can be abbreviated to  1  or  2  respectively.   The
              default  (lvm2)  can  be changed by setting format in the global
              section of the config file.

              This lets you proceed with read-only metadata operations such as
              lvchange  -ay and vgchange -ay even if the locking module fails.
              One use for this  is  in  a  system  init  script  if  the  lock
              directory is mounted read-only when the script runs.

       --addtag tag
              Add  the tag tag to a PV, VG or LV.  A tag is a word that can be
              used to group LVM2 objects of the same type together.  Tags  can
              be given on the command line in place of PV, VG or LV arguments.
              Tags should be prefixed with @ to avoid ambiguity.  Each tag  is
              expanded  by  replacing  it with all objects possessing that tag
              which are of the type expected by its position  on  the  command
              line.  PVs can only possess tags while they are part of a Volume
              Group: PV tags are discarded if the PV is removed from  the  VG.
              As  an example, you could tag some LVs as database and others as
              userdata and then activate the database ones with  lvchange  -ay
              @database.   Objects  can  possess multiple tags simultaneously.
              Only the new LVM2  metadata  format  supports  tagging:  objects
              using  the LVM1 metadata format cannot be tagged because the on-
              disk format does not support it.  Snapshots  cannot  be  tagged.
              Characters allowed in tags are: A-Z a-z 0-9 _ + . -

       --deltag tag
              Delete the tag tag from a PV, VG or LV, if it's present.

       --alloc AllocationPolicy
              The   allocation  policy  to  use:  contiguous,  cling,  normal,
              anywhere or inherit.  When a command needs to allocate  physical
              extents  from  the  volume group, the allocation policy controls
              how they are chosen.  Each volume group and logical  volume  has
              an  allocation policy.  The default for a volume group is normal
              which applies common-sense rules such as  not  placing  parallel
              stripes  on the same physical volume.  The default for a logical
              volume is inherit which applies  the  same  policy  as  for  the
              volume  group.  These policies can be changed using lvchange (8)
              and vgchange (8) or over-ridden  on  the  command  line  of  any
              command   that   performs  allocation.   The  contiguous  policy
              requires  that  new  extents  be  placed  adjacent  to  existing
              extents.   The  cling  policy  places  new  extents  on the same
              physical volume as existing extents in the same  stripe  of  the
              Logical Volume.  If there are sufficient free extents to satisfy
              an allocation request but normal doesn't use them, anywhere will
              - even if that reduces performance by placing two stripes on the
              same physical volume.

              N.B. The policies described above are not implemented fully yet.
              In  particular,  contiguous  free  space  cannot be broken up to
              satisfy allocation attempts.


              Directory  containing  lvm.conf  and  other  LVM  system  files.
              Defaults to "/etc/lvm".

       HOME   Directory containing .lvm_history if the internal readline shell
              is invoked.

              The volume group name that is assumed for  any  reference  to  a
              logical volume that doesn't specify a path.  Not set by default.


       The following characters are valid for VG and LV names: a-z A-Z 0-9 + _
       . -

       VG and LV names cannot begin with a hyphen.   There  are  also  various
       reserved  names that are used internally by lvm that can not be used as
       LV or VG names.  A VG cannot be called anything that exists in /dev/ at
       the time of creation, nor can it be called '.' or '..'.  A LV cannot be
       called '.' '..' 'snapshot' or  'pvmove'.  The  LV  name  may  also  not
       contain the strings '_mlog' or '_mimage'


       All  tools  return  a  status  code  of  zero on success or non-zero on




       clvmd(8),   lvchange(8),   lvcreate(8),   lvdisplay(8),    lvextend(8),
       lvmchange(8),  lvmdiskscan(8),  lvreduce(8),  lvremove(8), lvrename(8),
       lvresize(8),  lvs(8),  lvscan(8),  pvchange(8),  pvck(8),  pvcreate(8),
       pvdisplay(8),     pvmove(8),     pvremove(8),     pvs(8),    pvscan(8),
       vgcfgbackup(8),  vgchange(8),   vgck(8),   vgconvert(8),   vgcreate(8),
       vgdisplay(8),  vgextend(8),  vgimport(8), vgimportclone(8), vgmerge(8),
       vgmknodes(8), vgreduce(8), vgremove(8), vgrename(8), vgs(8), vgscan(8),
       vgsplit(8), readline(3), lvm.conf(5)