Click this button to go to the index for this section.

lvreduce(8)
NAME
  lvreduce - Decreases the number of physical extents allocated to a logical
  volume

SYNOPSIS
  /usr/sbin/lvreduce -m MirrorCopies | -l LogicalExtentsNumber [-f]
  LogicalVolumePath

DESCRIPTION
				     Note

       This command is no longer supported on Digital UNIX systems.
       Features formerly provided by the Logical Volume Manager (LVM)
       are now provided by the Logical Storage Manager (LSM).  Existing
       LVM volumes must be migrated to LSM, using an encapsulation
       process. For information about moving LVM volumes to LSM, see the
       vollvmencap(8) reference page and the manual Logical Storage
       Manager.


  The lvreduce command changes either the number of logical extents allocated
  to a logical volume specified with the LogicalVolumePath parameter or the
  number of physical extents allocated to each logical extent in the logical
  volume.  The change is determined according to which command flags you use.

FLAGS
  -f	    Forces the reduction of the number of logical extents without
	    first requesting confirmation.  This option can be used only if
	    the -l flag has been used.

  -m MirrorCopies
	    Sets the number of physical extents allocated for each logical
	    extent.
	    MirrorCopies (that is, mirrors) can be either 0 or 1. This means
	    that beyond the original copy, no other (0) or one (1) mirror
	    copy will contain the same data as the original copy.
	    MirrorCopies  must be less than the current number of mirrors for
	    the logical volume.	 Either this option or the -l option must be
	    supplied.

  -l LogicalExtentsNumber
	    Decreases the number of logical extents allocated to the
	    LogicalVolumePath.	LogicalExtentsNumber must be less than the
	    number of logical extents previously allocated to
	    LogicalVolumePath.
	    LogicalExtentsNumber represents the new total number of logical
	    extents within LogicalVolumePath. The change is accomplished by
	    deallocating the number of logical extents represented by the
	    difference between the previous number of extents and
	    LogicalExtentsNumber.
	    The lvreduce command asks for confirmation if you do not use the
	    -f flag.
	    You must use either this option (-l) or the -m option.



EXAMPLES
   1.  To decrease the number of the logical extents of logical volume lv03
       to one hundred, enter:
	    lvreduce -l	 100  /dev/vg01/lv03

   2.  To get one mirror (that is, two copies) for each logical extent of
       logical volume lv05, enter:
	    lvreduce -m	 1  /dev/vg01/lv05
       Each logical extent of logical volume lv05 is now singly mirrored.

CAUTIONS
  The Logical Volume Manager does not store any information about which
  physical extents contain useful data; therefore, using the -l option might
  lead to the loss of useful data.

FILES
  /usr/sbin/lvreduce
	    Specifies the command path.

RELATED INFORMATION
  Commands:  lvcreate(8), lvdisplay(8), lvextend(8), pvchange(8),
  pvdisplay(8)