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107 lines
3.8 KiB
Groff
107 lines
3.8 KiB
Groff
.TH PVMOVE 8 "LVM TOOLS #VERSION#" "Sistina Software UK" \" -*- nroff -*-
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.SH NAME
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pvmove \- move physical extents
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.SH SYNOPSIS
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.B pvmove
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[\-\-abort]
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[\-\-alloc AllocationPolicy]
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[\-b|\-\-background]
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[\-d|\-\-debug] [\-h|\-\-help] [\-i|\-\-interval Seconds]
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[\-\-noudevsync] [\-v|\-\-verbose] [\-n|\-\-name LogicalVolume]
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[SourcePhysicalVolume[:PE[-PE]...] [DestinationPhysicalVolume[:PE[-PE]...]...]]
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.SH DESCRIPTION
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.B pvmove
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allows you to move the allocated physical extents (PEs) on
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.I SourcePhysicalVolume
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to one or more other physical volumes (PVs).
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You can optionally specify a source
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.I LogicalVolume
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in which case only extents used by that LV will be moved to
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free (or specified) extents on
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.IR DestinationPhysicalVolume (s).
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If no
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.I DestinationPhysicalVolume
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is specifed, the normal allocation rules for the volume group are used.
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If \fBpvmove\fP gets interrupted for any reason (e.g. the machine crashes)
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then run \fBpvmove\fP again without any PhysicalVolume arguments to
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restart any moves that were in progress from the last checkpoint.
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Alternatively use \fBpvmove --abort\fP at any time to abort them
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at the last checkpoint.
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You can run more than one pvmove at once provided they are moving data
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off different SourcePhysicalVolumes, but additional pvmoves will ignore
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any logical volumes already in the process of being changed, so some
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data might not get moved.
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\fBpvmove\fP works as follows:
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1. A temporary 'pvmove' logical volume is created to store
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details of all the data movements required.
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2. Every logical volume in the volume group is searched
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for contiguous data that need moving
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according to the command line arguments.
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For each piece of data found, a new segment is added to the end of the
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pvmove LV.
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This segment takes the form of a temporary mirror to copy the data
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from the original location to a newly-allocated location.
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The original LV is updated to use the new temporary mirror segment
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in the pvmove LV instead of accessing the data directly.
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3. The volume group metadata is updated on disk.
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4. The first segment of the pvmove logical volume is activated and starts
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to mirror the first part of the data. Only one segment is mirrored at once
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as this is usually more efficient.
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5. A daemon repeatedly checks progress at the specified time interval.
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When it detects that the first temporary mirror is in-sync,
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it breaks that mirror so that only the new location for that data gets used
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and writes a checkpoint into the volume group metadata on disk.
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Then it activates the mirror for the next segment of the pvmove LV.
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6. When there are no more segments left to be mirrored,
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the temporary logical volume is removed and the volume group metadata
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is updated so that the logical volumes reflect the new data locations.
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Note that this new process cannot support the original LVM1
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type of on-disk metadata. Metadata can be converted using \fBvgconvert\fP(8).
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.SH OPTIONS
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.TP
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.I \-\-abort
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Abort any moves in progress.
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.TP
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.I \-\-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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.I \-b, \-\-background
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Run the daemon in the background.
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.TP
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.I \-i, \-\-interval Seconds
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Report progress as a percentage at regular intervals.
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.TP
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.I \-n, \-\-name " \fILogicalVolume\fR"
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Move only the extents belonging to
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.I LogicalVolume
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from
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.I SourcePhysicalVolume
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instead of all allocated extents to the destination physical volume(s).
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.SH EXAMPLES
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To move all logical extents of any logical volumes on
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.B /dev/hda4
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to free physical extents elsewhere in the volume group, giving verbose
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runtime information, use:
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.sp
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\ pvmove -v /dev/hda4
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.sp
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.SH SEE ALSO
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.BR lvm (8),
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.BR vgconvert (8)
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