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       lvreduce [-A|--autobackup {y|n}] [-d|--debug] [-f|--force]
       [-h|--help]     {-l|--extents     [-]LogicalExtentsNumber|
       -L|--size  [-]LogicalVolumeSize[kKmMgGtT]}  [-v|--verbose]


       lvreduce allows you to reduce the size of a  logical  vol­
       ume.   Be  careful  when reducing a logical volume's size,
       because data in the reduced part is lost!!!
       You should therefore ensure that the  (eg)  filesystem  on
       the volume is resized running lvreduce so that the extents
       that are to be removed are not in use.  If the  filesystem
       is  ext2  then  you can use the e2fsadm(8) command to both
       resize the filesystem and  the  logical  volume  together.
       Shrinking  snapshot  logical  volumes (see lvcreate(8) for
       information to create snapshots) is supported as well.

       -A, --autobackup y/n
              Controls automatic backup of VG metadata after  the
              change ( see vgcfgbackup(8) ). Default is yes.

       -d, --debug
              Enables  additional  debugging  output (if compiled
              with DEBUG).

       -f, --force
              Force size reduction without any question.

       -h, --help
              Print a usage message on standard output  and  exit

       -l, --extents [-]LogicalExtentsNumber
              Reduce  or  set the logical volume size in units of
              logical extents.  With the - sign the value will be
              subtracted  from  the  logical volume's actual size
              and without it the will be  taken  as  an  absolute

       -L, --size [-]LogicalVolumeSize[kKmMgGtT]
              Reduce  or  set the logical volume size in units of
              megabyte by default.  A size suffix of k for  kilo­
              byte,  m for megabyte, g for gigabyte or t for ter­
              abyte is optional.  With the - sign the value  will
              be subtracted from the logical volume's actual size
              and without it the will be  taken  as  an  absolute

       -v, --verbose
              Gives  verbose runtime information about lvreduce's

       4  logical volume doesn't exist
       5  error reading VGDA
       6  error getting index of logical volume
       7  new size of logical volume not smaller than old one
       8  error setting VGDA up for reduce
       9  error reducing logical volume in kernel
       10 error writing VGDA to physical volume(s)
       11 error getting index for read/write statistic transfer
       12 error getting status of logical volume from kernel
       13 error setting up copy on write exception table

       95 driver/module not in kernel
       96 invalid I/O protocol version
       97 error locking logical volume manager
       98 invalid lvmtab (run vgscan(8))
       99 invalid command line


              If  this variable is set to "no" then the automatic
              backup of VG metadata is turned off.

              This variable determins the backup history depth of
              kept VGDA copy files in /etc/lvmconf. It can be set
              to a positive number between 0 and 999.  The higher
              this  number  is  the  more  steps  are you able to
              backup with vgcfgrestore(8) from  the  changes  you
              make to your volume groups.

              The  default Volume Group Name to use. Setting this
              variable enables you to enter just the Logical Vol­
              ume Name rather than its complete path.

See also

       lvm(8), lvcreate(8), lvextend(8), lvchange(8), e2fsadm(8)


       Heinz Mauelshagen <Linux-LVM@Sistina.com>

Heinz Mauelshagen           LVM TOOLS                 LVREDUCE(8)



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