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3d425215a8
Update units_to_bytes() to support (S)ectors: 500 bytes. - 500 byte (S)ectors is of questionable value but it adds to consistency if a user happens to use --units S. This seems better than an error. Updated test/t-covercmd.sh to test --units [hS] Document the units that can be displayed via --units uniformly. - (p)etabytes and (e)xabytes were missing in pvs, vgs and lvs man pages. Made lvreduce man page "... in units of megabytes." consistent (with the lvextend and lvresize man pages).
68 lines
2.4 KiB
Groff
68 lines
2.4 KiB
Groff
.TH LVREDUCE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvreduce \- reduce the size of a logical volume
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.SH SYNOPSIS
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.B lvreduce
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[\-A|\-\-autobackup y|n] [\-d|\-\-debug] [\-f|\-\-force]
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[\-h|\-?|\-\-help]
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{\-l|\-\-extents [\-]LogicalExtentsNumber[%{VG|LV|FREE}] |
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\-L|\-\-size [\-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
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[\-t|\-\-test]
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[\-v|\-\-verbose] LogicalVolume[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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.B 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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.B 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 for common options.
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.TP
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.I \-f, \-\-force
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Force size reduction without any question.
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.TP
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.I \-l, \-\-extents [\-]LogicalExtentsNumber[%{VG|LV|FREE}]
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Reduce or set the logical volume size in units of logical extents.
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With the - sign the value will be subtracted from
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the logical volume's actual size and without it the will be taken as
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an absolute size.
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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 %VG or relative to the existing
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size of the Logical Volume with the suffix %LV or as a percentage of the remaining
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free space in the Volume Group with the suffix %FREE.
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.TP
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.I \-L, \-\-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 k for kilobyte, m for megabyte,
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g for gigabytes, t for terabytes, p for petabytes
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or e for exabytes is optional.
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With the - 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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.SH Example
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"lvreduce -l -3 vg00/lvol1" reduces the size of logical volume lvol1
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in volume group vg00 by 3 logical extents.
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.SH SEE ALSO
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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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