lvchange --- change attributes of a logical volume


   lvchange [-a|--activate [a][e|s|l]{y|n}] [--activationmode
   {complete|degraded|partial}] [--addtag Tag] [-K|--ignoreactivationskip]
   [-k|--setactivationskip {y|n}] [--alloc AllocationPolicy]
   [-A|--autobackup {y|n}] [--rebuild PhysicalVolume] [--cachemode
   {passthrough|writeback|writethrough}] [--cachepolicy Policy]
   [--cachesettings Key=Value] [--commandprofile ProfileName]
   [-C|--contiguous {y|n}] [-d|--debug] [--deltag Tag] [--detachprofile]
   [--discards {ignore|nopassdown|passdown}] [--errorwhenfull {y|n}]
   [-h|-?|--help] [--ignorelockingfailure] [--ignoremonitoring]
   [--ignoreskippedcluster] [--metadataprofile ProfileName] [--monitor
   {y|n}] [--noudevsync] [-P|--partial] [-p|--permission {r|rw}]
   [-M|--persistent {y|n} [--major Major] [--minor Minor]] [--poll {y|n}]
   [--[raid]maxrecoveryrate Rate] [--[raid]minrecoveryrate Rate]
   [--[raid]syncaction {check|repair}] [--[raid]writebehind IOCount]
   [--[raid]writemostly PhysicalVolume[:{y|n|t}]] [-r|--readahead
   {ReadAheadSectors|auto|none}] [--refresh] [--reportformat {basic|json}]
   [--resync] [-S|--select Selection] [--sysinit] [-t|--test]
   [-v|--verbose] [-Z|--zero {y|n}] [LogicalVolumePath...]


   lvchange allows you to  change  the  attributes  of  a  logical  volume
   including making them known to the kernel ready for use.


   See lvm(8) for common options.

   -a|--activate [a][e|s|l]{y|n}
          Controls  the  availability  of  the  logical  volumes  for use.
          Communicates  with   the   kernel   device-mapper   driver   via
          libdevmapper  to  activate (-ay) or deactivate (-an) the logical
          Activation  of  a  logical  volume  creates  a   symbolic   link
          /dev/VolumeGroupName/LogicalVolumeName  pointing  to  the device
          node.  This link is removed on deactivation.  All  software  and
          scripts  should access the device through this symbolic link and
          present this as the name of the device.  The location  and  name
          of the underlying device node may depend on the distribution and
          configuration (e.g. udev)  and  might  change  from  release  to
          If  autoactivation  option is used (-aay), the logical volume is
          activated   only   if   it    matches    an    item    in    the
          activation/auto_activation_volume_list  set  in lvm.conf(5).  If
          this list is not  set,  then  all  volumes  are  considered  for
          activation.  The  -aay  option should be also used during system
          boot so it's possible to select which volumes to activate  using
          the activation/auto_activation_volume_list setting.
          In  a  clustered  VG,  clvmd  is  used  for  activation, and the
          following options are possible:

          With -aey, clvmd activates the LV in  exclusive  mode  (with  an
          exclusive lock), allowing a single node to activate the LV.

          With  -asy, clvmd activates the LV in shared mode (with a shared
          lock), allowing multiple nodes to activate the LV  concurrently.
          If  the  LV  type  prohibits shared access, such as an LV with a
          snapshot, the 's' option is ignored and  an  exclusive  lock  is

          With  -ay  (no mode specified), clvmd activates the LV in shared
          mode if the LV type allows concurrent access, such as  a  linear
          LV.  Otherwise, clvmd activates the LV in exclusive mode.

          With  -aey,  -asy, and -ay, clvmd attempts to activate the LV on
          all nodes.  If exclusive mode is used,  then  only  one  of  the
          nodes will be successful.

          With -an, clvmd attempts to deactivate the LV on all nodes.

          With  -aly,  clvmd  activates the LV only on the local node, and
          -aln deactivates only on the local node.  If the LV type  allows
          concurrent   access,   then   shared  mode  is  used,  otherwise

          LVs with snapshots are always activated exclusively because they
          can only be used on one node at once.

          For local VGs -ay, -aey, and -asy are all equivalent.

   --activationmode {complete|degraded|partial}
          The  activation  mode  determines  whether  logical  volumes are
          allowed to activate when  there  are  physical  volumes  missing
          (e.g.   due   to  a  device  failure).   complete  is  the  most
          restrictive; allowing only those logical volumes to be activated
          that  are not affected by the missing PVs.  degraded allows RAID
          logical volumes to be activated even if they have  PVs  missing.
          (Note  that  the  "mirror" segment type is not considered a RAID
          logical  volume.   The  "raid1"  segment  type  should  be  used
          instead.)   Finally,  partial  allows  any  logical volume to be
          activated even if portions are  missing  due  to  a  missing  or
          failed PV.  This last option should only be used when performing
          recovery or repair operations.  degraded is  the  default  mode.
          To change it, modify activation_mode in lvm.conf(5).

          Ignore the flag to skip Logical Volumes during activation.

   -k|--setactivationskip {y|n}
          Controls  whether Logical Volumes are persistently flagged to be
          skipped during activation. By default, thin snapshot volumes are
          flagged for activation skip.  To activate such volumes, an extra
          --ignoreactivationskip option must be used.   The  flag  is  not
          applied   during  deactivation.  To  see  whether  the  flag  is
          attached, use lvs(8) command where the  state  of  the  flag  is
          reported within lv_attr bits.

   --cachemode {passthrough|writeback|writethrough}
          Specifying a cache mode determines when the writes to a cache LV
          are considered complete.  When writeback is specified,  a  write
          is considered complete as soon as it is stored in the cache pool
          LV.  If writethough is specified, a write is considered complete
          only  when  it  has  been stored in the cache pool LV and on the
          origin LV.  While writethrough may be slower for writes,  it  is
          more resilient if something should happen to a device associated
          with the cache pool LV. With passthrough  mode,  all  reads  are
          served  from origin LV (all reads miss the cache) and all writes
          are forwarded to the origin LV; additionally, write  hits  cause
          cache block invalidates. See lvmcache(7) for more details.

   --cachepolicy Policy, --cachesettings Key=Value
          Only  applicable  to  cached LVs; see also lvmcache(7). Sets the
          cache policy and its associated tunable settings. In  most  use-
          cases, default values should be adequate.

   -C|--contiguous {y|n}
          Tries  to  set  or  reset  the  contiguous allocation policy for
          logical volumes. It's only possible to change  a  non-contiguous
          logical  volume's allocation policy to contiguous, if all of the
          allocated physical extents are already contiguous.

          Detach any metadata configuration  profiles  attached  to  given
          Logical  Volumes.  See  lvm.conf(5)  for  more information about
          metadata profiles.

   --discards {ignore|nopassdown|passdown}
          Set this to ignore to ignore any discards  received  by  a  thin
          pool Logical Volume.  Set to nopassdown to process such discards
          within the thin  pool  itself  and  allow  the  no-longer-needed
          extents  to  be  overwritten  by new data.  Set to passdown (the
          default) to process them both within the thin pool itself and to
          pass them down the underlying device.

   --errorwhenfull {y|n}
          Sets  thin  pool  behavior  when  data  space  is  exhaused. See
          lvcreate(8) for information.

          Make no attempt to interact with dmeventd  unless  --monitor  is
          specified.   Do not use this if dmeventd is already monitoring a

   --major Major
          Sets the major number. This option is supported  only  on  older
          systems  (kernel  version  2.4)  and  is ignored on modern Linux
          systems where major numbers are dynamically assigned.

   --minor Minor
          Set the minor number.

   --metadataprofile ProfileName
          Uses and  attaches  ProfileName  configuration  profile  to  the
          logical   volume   metadata.  Whenever  the  logical  volume  is
          processed next time, the profile is  automatically  applied.  If
          the  volume  group  has  another  profile  attached, the logical
          volume  profile  is  preferred.   See   lvm.conf(5)   for   more
          information about metadata profiles.

   --monitor {y|n}
          Start  or  stop monitoring a mirrored or snapshot logical volume
          with dmeventd, if it is  installed.   If  a  device  used  by  a
          monitored  mirror  reports  an I/O error, the failure is handled
          according        to        mirror_image_fault_policy         and
          mirror_log_fault_policy set in lvm.conf(5).

          Disable  udev  synchronisation.  The  process  will not wait for
          notification from udev.  It 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.

   -p|--permission {r|rw}
          Change access permission to read-only or read/write.

   -M|--persistent {y|n}
          Set  to y to make the minor number specified persistent.  Change
          of persistent numbers is not supported for pool volumes.

   --poll {y|n}
          Without polling a logical volume's  backgrounded  transformation
          process  will  never complete.  If there is an incomplete pvmove
          or lvconvert (for example, on  rebooting  after  a  crash),  use
          --poll  y  to  restart  the  process  from  its last checkpoint.
          However, it may not be appropriate to immediately poll a logical
          volume  when  it  is  activated,  use --poll n to defer and then
          --poll y to restart the process.

   --[raid]rebuild PhysicalVolume
          Option   can    be    repeated    multiple    times.     Selects
          PhysicalVolume(s)  to  be  rebuild in a RaidLV.  Use this option
          instead of --resync or --[raid]syncaction repair in case the PVs
          with   corrupted  data  are  known  and  their  data  should  be
          reconstructed  rather  than  reconstructing  default  (rotating)
          E.g.  in  a  raid1  mirror,  the master leg on /dev/sda may hold
          corrupt data due to a known transient disk error, thus
          lvchange --rebuild /dev/sda LV
          will request the master leg to be rebuild rather than rebuilding
          all  other  legs from the master.  On a raid5 with rotating data
          and parity
          lvchange --rebuild /dev/sda LV
          will rebuild all  data  and  parity  blocks  in  the  stripe  on

   --[raid]maxrecoveryrate Rate[b|B|s|S|k|K|m|M|g|G]
          Sets  the maximum recovery rate for a RAID logical volume.  Rate
          is specified as an amount per second  for  each  device  in  the
          array.   If  no suffix is given, then KiB/sec/device is assumed.
          Setting the recovery rate to 0 means it will be unbounded.

   --[raid]minrecoveryrate Rate[b|B|s|S|k|K|m|M|g|G]
          Sets the minimum recovery rate for a RAID logical volume.   Rate
          is  specified  as  an  amount  per second for each device in the
          array.  If no suffix is given, then KiB/sec/device  is  assumed.
          Setting the recovery rate to 0 means it will be unbounded.

   --[raid]syncaction {check|repair}
          This  argument  is used to initiate various RAID synchronization
          operations.  The check and repair options provide a way to check
          the  integrity  of  a  RAID logical volume (often referred to as
          "scrubbing").  These options cause the RAID  logical  volume  to
          read  all  of  the data and parity blocks in the array and check
          for  any  discrepancies  (e.g.  mismatches  between  mirrors  or
          incorrect  parity  values).  If check is used, the discrepancies
          will be counted but  not  repaired.   If  repair  is  used,  the
          discrepancies  will  be  corrected as they are encountered.  The
          lvs(8) command can be used to show the number  of  discrepancies
          found or repaired.

   --[raid]writebehind IOCount
          Specify  the  maximum  number  of  outstanding  writes  that are
          allowed to devices in a RAID1 logical volume that are marked  as
          write-mostly.   Once  this  value  is  exceeded,  writes  become
          synchronous (i.e. all writes to  the  constituent  devices  must
          complete  before  the  array  signals  the write has completed).
          Setting the value to zero clears the preference and  allows  the
          system to choose the value arbitrarily.

   --[raid]writemostly PhysicalVolume[:{y|n|t}]
          Mark  a  device  in a RAID1 logical volume as write-mostly.  All
          reads  to  these  drives  will  be  avoided  unless   absolutely
          necessary.   This  keeps  the  number  of I/Os to the drive to a
          minimum.  The  default  behavior  is  to  set  the  write-mostly
          attribute  for  the  specified  physical  volume  in the logical
          volume.  It is possible to also remove the write-mostly flag  by
          appending  a  ":n" to the physical volume or to toggle the value
          by specifying ":t".  The --writemostly argument can be specified
          more  than  one  time in a single command; making it possible to
          toggle the write-mostly attributes for all the physical  volumes
          in a logical volume at once.

   -r|--readahead {ReadAheadSectors|auto|none}
          Set  read ahead sector count of this logical volume.  For volume
          groups with metadata in  lvm1  format,  this  must  be  a  value
          between  2  and  120 sectors.  The default value is "auto" which
          allows the kernel to  choose  a  suitable  value  automatically.
          "none" is equivalent to specifying zero.

          If  the  logical volume is active, reload its metadata.  This is
          not  necessary  in  normal  operation,  but  may  be  useful  if
          something  has gone wrong or if you're doing clustering manually
          without a clustered lock manager.

          Forces the complete resynchronization of a  mirror.   In  normal
          circumstances   you   should   not   need  this  option  because
          synchronization happens automatically.  Data is  read  from  the
          primary mirror device and copied to the others, so this can take
          a considerable amount of time - and during  this  time  you  are
          without a complete redundant copy of your data.

          Indicates  that  lvchange(8)  is being invoked from early system
          initialisation scripts (e.g. rc.sysinit or  an  initrd),  before
          writeable filesystems are available. As such, some functionality
          needs to be disabled and this option acts as  a  shortcut  which
          selects  an  appropriate  set  of  options.  Currently  this  is
          equivalent to using  --ignorelockingfailure, --ignoremonitoring,
          --poll   n   and  setting  LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES
          environment variable.

          If --sysinit is used in conjunction with lvmetad(8) enabled  and
          running,  autoactivation is preferred over manual activation via
          direct  lvchange  call.   Logical  volumes   are   autoactivated
          according to auto_activation_volume_list set in lvm.conf(5).

   -Z|--zero {y|n}
          Set zeroing mode for thin pool. Note: already provisioned blocks
          from pool in non-zero mode are not cleared  in  unwritten  parts
          when setting zero to y.


          Suppress locking failure messages.


   Changes the permission on volume lvol1 in volume group vg00 to be read-

   lvchange -pr vg00/lvol1


   lvm(8),  lvmetad(8),  lvs(8),  lvcreate(8),  vgchange(8),  lvmcache(7),
   lvmthin(7), lvm.conf(5)


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