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014ba37cb1
While stripe size is twice the physical extent size, the original code will not reduce stripe size to maximum (physical extent size). Signed-off-by: Zhiqing Zhang <zhangzq.fnst@cn.fujitsu.com>
121 lines
5.1 KiB
Groff
121 lines
5.1 KiB
Groff
.TH LVRESIZE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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lvresize \- resize a logical volume
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.SH SYNOPSIS
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.B lvresize
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.RB [ \-\-alloc " " \fIAllocationPolicy ]
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.RB [ \-\-noudevsync ]
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.RB [ \-i | \-\-stripes " " \fIStripes
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.RB [ \-I | \-\-stripesize " " \fIStripeSize ]]
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.RB {[ \-l | \-\-extents
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.RI [ + | \- ] LogicalExtentsNumber [ % { VG | LV | PVS | FREE | ORIGIN "}] |"
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.RB [ \-L | \-\-size
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.RI [ + | \- ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]}
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.RB [ \-\-poolmetadatasize
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.RI [ + ] MetadataVolumeSize [ bBsSkKmMgG ]
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.RB [ \-f | \-\-force ]
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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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.RI [ PhysicalVolumePath [ :PE [ -PE ]]...]
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.SH DESCRIPTION
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lvresize allows you to resize a logical volume.
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Be careful when reducing a logical volume's size, because data in the reduced
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part is lost!!!
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You should therefore ensure that any filesystem on the volume is
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shrunk first so that the extents that are to be removed are not in use.
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Resizing snapshot logical volumes (see
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.BR lvcreate (8)
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for information about creating 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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.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 resize without prompting even when it may cause data loss.
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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 \-r ", " \-\-resizefs
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Resize underlying filesystem together with the logical volume using
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\fBfsadm\fR(8).
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.TP
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.IR \fB\-l ", " \fB\-\-extents " [" + | - ] LogicalExtentsNumber [ % { VG | LV | PVS | FREE | ORIGIN }]
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Change or set the logical volume size in units of logical extents.
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With the \fI+\fP or \fI-\fP sign the value is added to or subtracted from the actual size
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of the logical volume and without it, the value is taken as an absolute one.
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The total number of physical extents affected will be
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greater than this 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
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the remaining free space of the PhysicalVolumes on the command line with the
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suffix \fI%PVS\fP, as a percentage of the remaining free space in the
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Volume Group with the suffix \fI%FREE\fP, or (for a snapshot) as a percentage
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of the total space in the Origin Logical Volume with the suffix \fI%ORIGIN\fP.
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The resulting value is rounded downward for the subtraction otherwise
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it is rounded upward.
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N.B. In a future release, when expressed as a percentage with PVS, VG or FREE,
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the number will be treated as an approximate total number of physical extents
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to be allocated or freed (including extents used by any mirrors, for example).
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The code may currently allocate or remove more space than you might otherwise
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expect.
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.TP
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.IR \fB\-L ", " \fB\-\-size " [" + | - ] LogicalVolumeSize [ bBsSkKmMgGtTpPeE ]
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Change or set the logical volume size in units of megabytes.
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A size suffix of \fIM\fP for megabytes,
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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 or \fI-\fP sign the value is added or subtracted
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from the actual size of the logical volume and rounded
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to the full extent size and without it,
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the value is taken as an absolute one.
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.TP
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.BR \-i ", " \-\-stripes " " \fIStripes
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Gives the number of stripes to use when extending a Logical Volume.
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Defaults to whatever the last segment of the Logical Volume uses.
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Not applicable to LVs using the original metadata LVM format, which must
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use a single value throughout.
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.TP
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.IR \fB\-\-poolmetadatasize " [" + ] MetadataVolumeSize [ bBsSkKmMgG ]
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Change or set the thin pool metadata logical volume size.
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With the \fI+\fP sign the value is added to the actual size
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of the metadata volume and rounded to the full extent size
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and without it, the value is taken as an absolute one.
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Maximal size is 16GiB. Default unit is megabytes.
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.TP
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.BR \-I ", " \-\-stripesize " " \fIStripeSize
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Gives the number of kilobytes for the granularity of the stripes.
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Defaults to whatever the last segment of the Logical Volume uses.
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Not applicable to LVs using the original metadata LVM format, which
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must use a single value throughout.
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.br
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StripeSize must be 2^n (n = 2 to 9) for metadata in LVM1 format.
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For metadata in LVM2 format, the stripe size may be a larger
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power of 2 but must not exceed the physical extent size.
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.TP
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.B \-\-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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.SH EXAMPLES
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.br
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Extend a logical volume vg1/lv1 by 16MB using physical extents
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/dev/sda:0-1 and /dev/sdb:0-1 for allocation of extents:
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.sp
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.B lvresize -L+16M vg1/lv1 /dev/sda:0-1 /dev/sdb:0-1
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.SH SEE ALSO
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.BR fsadm (8),
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.BR lvm (8),
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.BR lvconvert (8),
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.BR lvcreate (8),
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.BR lvreduce (8),
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.BR lvchange (8)
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