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108 lines
4.0 KiB
Groff
108 lines
4.0 KiB
Groff
.TH LVREDUCE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvreduce \(em reduce the size of a logical volume
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.SH SYNOPSIS
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.B lvreduce
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.RB [ \-A | \-\-autobackup
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.RI { y | n }]
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.RB [ \-\-commandprofile
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.IR ProfileName ]
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.RB [ \-d | \-\-debug ]
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.RB [ \-h | \-\-help ]
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.RB [ \-t | \-\-test ]
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.RB [ \-v | \-\-verbose ]
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.RB [ \-\-version ]
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.RB [ \-f | \-\-force ]
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.RB [ \-\-noudevsync ]
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.RB { \-l | \-\-extents
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.RI [ \- ] LogicalExtentsNumber [ % { VG | LV | FREE | ORIGIN "}] |"
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.RB [ \-L | \-\-size
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.RI [ \- ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]}
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.RB [ \-n | \-\-nofsck ]
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.RB [ \-r | \-\-resizefs ]
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.IR LogicalVolume { Name | Path }
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.SH DESCRIPTION
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lvreduce allows you to reduce the size of a logical volume.
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Be careful when reducing a logical volume's size, because data in the
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reduced part is lost!!!
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.br
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You should therefore ensure that any filesystem on the volume is
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resized
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.I before
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running lvreduce so that the extents that are to be removed are not in use.
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.br
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Shrinking snapshot logical volumes (see
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.BR lvcreate (8)
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for information to create snapshots) is supported as well.
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But to change the number of copies in a mirrored logical
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volume use
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.BR lvconvert (8).
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.br
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Sizes will be rounded if necessary - for example, the volume size must
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be an exact number of extents and the size of a striped segment must
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be a multiple of the number of stripes.
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.br
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.SH OPTIONS
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See \fBlvm\fP(8) for common options.
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.TP
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.BR \-f ", " \-\-force
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Force size reduction without prompting even when it may cause data loss.
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.TP
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.IR \fB\-l ", " \fB\-\-extents " [" \- ] LogicalExtentsNumber [ % { VG | LV | FREE | ORIGIN }]
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Reduce or set the logical volume size in units of logical extents.
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With the \fI-\fP sign the value will be subtracted from
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the logical volume's actual size and without it the value will be taken
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as an absolute size.
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The total number of physical extents freed will be greater than this logical
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value if, for example, the volume is mirrored.
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The number can also be expressed as a percentage of the total space
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in the Volume Group with the suffix \fI%VG\fP, relative to the existing
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size of the Logical Volume with the suffix \fI%LV\fP, as a percentage of the
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remaining free space in the Volume Group with the suffix \fI%FREE\fP, or (for
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a snapshot) as a percentage of the total space in the Origin Logical
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Volume with the suffix \fI%ORIGIN\fP.
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The resulting value for the subtraction is rounded downward, for the absolute
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size it is rounded upward.
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N.B. In a future release, when expressed as a percentage with VG or FREE, the
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number will be treated as an approximate total number of physical extents to be
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freed (including extents used by any mirrors, for example). The code may
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currently release more space than you might otherwise expect.
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.TP
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.IR \fB\-L ", " \fB\-\-size " [" \- ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]
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Reduce or set the logical volume size in units of megabytes.
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A size suffix of \fIk\fP for kilobyte, \fIm\fP for megabyte,
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\fIg\fP for gigabytes, \fIt\fP for terabytes, \fIp\fP for petabytes
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or \fIe\fP for exabytes is optional.
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With the \fI\-\fP sign the value will be subtracted from
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the logical volume's actual size and without it it will be taken as
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an absolute size.
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.TP
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.BR \-n ", " \-\-nofsck
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Do not perform fsck before resizing filesystem when filesystem
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requires it. You may need to use \fB\-\-force\fR to proceed with
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this option.
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.TP
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.BR \-\-noudevsync
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Disable udev synchronisation. The
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process will not wait for notification from udev.
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It will continue irrespective of any possible udev processing
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in the background. You should only use this if udev is not running
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or has rules that ignore the devices LVM2 creates.
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.TP
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.BR \-r ", " \-\-resizefs
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Resize underlying filesystem together with the logical volume using
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.BR fsadm (8).
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.SH Examples
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Reduce the size of logical volume lvol1 in volume group vg00 by 3 logical extents:
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.sp
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.B lvreduce \-l \-3 vg00/lvol1
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.SH SEE ALSO
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.BR fsadm (8),
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.BR lvchange (8),
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.BR lvconvert (8),
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.BR lvcreate (8),
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.BR lvextend (8),
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.BR lvm (8),
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.BR lvresize (8),
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.BR vgreduce (8)
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