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143 lines
4.3 KiB
Groff
143 lines
4.3 KiB
Groff
.TH LVCONVERT 8 "LVM TOOLS #VERSION#" "Red Hat, Inc" \" -*- nroff -*-
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.SH NAME
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lvconvert \- convert a logical volume from linear to mirror or snapshot
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.SH SYNOPSIS
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.B lvconvert
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\-m|\-\-mirrors Mirrors [\-\-mirrorlog {disk|core}] [\-\-corelog] [\-R|\-\-regionsize MirrorLogRegionSize]
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[\-A|\-\-alloc AllocationPolicy]
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[\-b|\-\-background] [\-f|\-\-force] [\-i|\-\-interval Seconds]
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[\-h|\-?|\-\-help]
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[\-\-noudevsync]
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[\-v|\-\-verbose] [\-y|\-\-yes]
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[\-\-version]
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.br
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LogicalVolume[Path] [PhysicalVolume[Path][:PE[-PE]]...]
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.br
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.br
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.B lvconvert
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\-s|\-\-snapshot [\-c|\-\-chunksize ChunkSize]
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[\-h|\-?|\-\-help]
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[\-\-noudevsync]
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[\-v|\-\-verbose]
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[\-Z|\-\-zero y|n]
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[\-\-version]
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.br
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OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]
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.B lvconvert
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\-\-repair
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[\-h|\-?|\-\-help]
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[\-v|\-\-verbose]
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[\-\-version]
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LogicalVolume[Path] [PhysicalVolume[Path]...]
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.SH DESCRIPTION
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lvconvert will change a linear logical volume to a mirror
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logical volume or to a snapshot of linear volume and vice versa.
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It is also used to add and remove disk logs from mirror devices.
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.SH OPTIONS
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See \fBlvm\fP for common options.
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.br
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Exactly one of \-\-mirrors, \-\-repair or \-\-snapshot arguments required.
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.br
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.TP
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.I \-m, \-\-mirrors Mirrors
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Specifies the degree of the mirror you wish to create.
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For example, "-m 1" would convert the original logical
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volume to a mirror volume with 2-sides; that is, a
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linear volume plus one copy.
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.TP
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.I \-\-mirrorlog {disk|core}
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Specifies the type of log to use.
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The default is disk, which is persistent and requires
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a small amount of storage space, usually on a separate device
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from the data being mirrored.
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Core may be useful for short-lived mirrors: It means the mirror is
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regenerated by copying the data from the first device again every
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time the device is activated - perhaps, for example, after every reboot.
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.TP
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.I \-\-corelog
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The optional argument "--corelog" is the same as specifying "--mirrorlog core".
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.TP
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.I \-R, \-\-regionsize MirrorLogRegionSize
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A mirror is divided into regions of this size (in MB), and the mirror log
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uses this granularity to track which regions are in sync.
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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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.br
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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 \-\-repair
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Repair a mirror after suffering a disk failure. The mirror will be brought back
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into a consistent state. By default, the original number of mirrors will be
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restored if possible. Specify \-y on the command line to skip the prompts.
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Use \-f if you do not want any replacement. Additionally, you may use
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\-\-use-policies to use the device replacement policy specified in lvm.conf,
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viz. activation/mirror_log_fault_policy or
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activation/mirror_device_fault_policy.
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.br
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.TP
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.I \-s, \-\-snapshot
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Create a snapshot from existing logical volume using another
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existing logical volume as its origin.
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.TP
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.I \-c, \-\-chunksize ChunkSize
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Power of 2 chunk size for the snapshot logical volume between 4k and 512k.
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.TP
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.I \-Z, \-\-zero y|n
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Controls zeroing of the first KB of data in the snapshot.
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If the volume is read-only the snapshot will not be zeroed.
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.br
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.SH Examples
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"lvconvert -m1 vg00/lvol1"
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.br
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converts the linear logical volume "vg00/lvol1" to
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a two-way mirror logical volume.
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"lvconvert --mirrorlog core vg00/lvol1"
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.br
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converts a mirror with a disk log to a
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mirror with an in-memory log.
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"lvconvert --mirrorlog disk vg00/lvol1"
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.br
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converts a mirror with an in-memory log
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to a mirror with a disk log.
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"lvconvert -m0 vg00/lvol1"
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.br
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converts a mirror logical volume to a linear logical
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volume.
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.br
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.br
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"lvconvert -s vg00/lvol1 vg00/lvol2"
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.br
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converts logical volume "vg00/lvol2" to snapshot of original volume "vg00/lvol1"
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.br
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"lvconvert -m1 vg00/lvol1 /dev/sda:0-15 /dev/sdb:0-15"
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.br
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converts linear logical volume "vg00/lvol1" to a two-way mirror, using physical
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extents /dev/sda:0-15 and /dev/sdb:0-15 for allocation of new extents.
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.SH SEE ALSO
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.BR lvm (8),
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.BR vgcreate (8),
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.BR lvremove (8),
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.BR lvrename (8),
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.BR lvextend (8),
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.BR lvreduce (8),
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.BR lvdisplay (8),
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.BR lvscan (8)
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