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51c8cf97af
We want to keep this logic - when LV is extend - extend the LV by at least given amount, when LV is reduced - reduce the LV by at most given amount. So for this the rounding needs to be used. Current logic which seems to satisfy give rule is to round up all extent values for LV resize upward except for values with '-' sign that are round downward. This patch also fixes the problem when lvextend --use-polices tried to extend LV the by i.e. 20% - but the resulting 20% were smaller the extent size thus before this patch no extension happened.
103 lines
4.1 KiB
Groff
103 lines
4.1 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 [ \-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 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 substraction otherwise
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it is rounded upward.
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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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.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).
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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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