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-.TH LVREDUCE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
-.SH NAME
-lvreduce \- reduce the size of a logical volume
-.SH SYNOPSIS
-.B lvreduce
-.RB [ \-A | \-\-autobackup
-.RI { y | n }]
-.RB [ \-d | \-\-debug ]
-.RB [ \-h | \-\-help ]
-.RB [ \-t | \-\-test ]
-.RB [ \-v | \-\-verbose ]
-.RB [ \-\-version ]
-.RB [ \-f | \-\-force ]
-.RB [ \-\-noudevsync ]
-.RB { \-l | \-\-extents
-.RI [ \- ] LogicalExtentsNumber [ % { VG | LV | FREE | ORIGIN "}] |"
-.RB [ \-L | \-\-size
-.RI [ \- ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]}
-.RB [ \-n | \-\-nofsck ]
-.RB [ \-r | \-\-resizefs ]
-.IR LogicalVolume { Name | Path }
-.SH DESCRIPTION
-lvreduce allows you to reduce the size of a logical volume.
-Be careful when reducing a logical volume's size, because data in the
-reduced part is lost!!!
-.br
-You should therefore ensure that any filesystem on the volume is
-resized
-.I before
-running lvreduce so that the extents that are to be removed are not in use.
-.br
-Shrinking snapshot logical volumes (see
-.BR lvcreate (8)
-for information to create snapshots) is supported as well.
-But to change the number of copies in a mirrored logical
-volume use
-.BR lvconvert (8).
-.br
-Sizes will be rounded if necessary - for example, the volume size must
-be an exact number of extents and the size of a striped segment must
-be a multiple of the number of stripes.
-.br
-.SH OPTIONS
-See \fBlvm\fP(8) for common options.
-.TP
-.BR \-f ", " \-\-force
-Force size reduction without prompting even when it may cause data loss.
-.TP
-.IR \fB\-l ", " \fB\-\-extents " [" \- ] LogicalExtentsNumber [ % { VG | LV | FREE | ORIGIN }]
-Reduce or set the logical volume size in units of logical extents.
-With the \fI-\fP sign the value will be subtracted from
-the logical volume's actual size and without it the value will be taken
-as an absolute size.
-The number can also be expressed as a percentage of the total space
-in the Volume Group with the suffix \fI%VG\fP, relative to the existing
-size of the Logical Volume with the suffix \fI%LV\fP, as a percentage of the
-remaining free space in the Volume Group with the suffix \fI%FREE\fP, or (for
-a snapshot) as a percentage of the total space in the Origin Logical
-Volume with the suffix \fI%ORIGIN\fP.
-The resulting value for the substraction is rounded downward, for the absolute
-size it is rounded upward.
-.TP
-.IR \fB\-L ", " \fB\-\-size " [" \- ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]
-Reduce or set the logical volume size in units of megabytes.
-A size suffix of \fIk\fP for kilobyte, \fIm\fP for megabyte,
-\fIg\fP for gigabytes, \fIt\fP for terabytes, \fIp\fP for petabytes
-or \fIe\fP for exabytes is optional.
-With the \fI\-\fP sign the value will be subtracted from
-the logical volume's actual size and without it it will be taken as
-an absolute size.
-.TP
-.BR \-n ", " \-\-nofsck
-Do not perform fsck before resizing filesystem when filesystem
-requires it. You may need to use \fB\-\-force\fR to proceed with
-this option.
-.TP
-.BR \-\-noudevsync
-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.
-.TP
-.BR \-r ", " \-\-resizefs
-Resize underlying filesystem together with the logical volume using
-.BR fsadm (8).
-.SH Examples
-Reduce the size of logical volume lvol1 in volume group vg00 by 3 logical extents:
-.sp
-.B lvreduce \-l \-3 vg00/lvol1
-.SH SEE ALSO
-.BR fsadm (8),
-.BR lvchange (8),
-.BR lvconvert (8),
-.BR lvcreate (8),
-.BR lvextend (8),
-.BR lvm (8),
-.BR lvresize (8),
-.BR vgreduce (8)