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GNU/Linux |
CentOS 5.4 |
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lvconvert(8) |
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lvconvert − convert a logical volume from linear to mirror or snapshot
lvconvert
−m|−−mirrors Mirrors
[−−mirrorlog {disk|core}]
[−−corelog] [−R|−−regionsize
MirrorLogRegionSize] [−A|−−alloc
AllocationPolicy] [−b|−−background]
[−i|−−interval Seconds]
[−h|−?|−−help]
[−v|−−verbose] [−−version]
LogicalVolume[Path] [PhysicalVolume[Path]...]
lvconvert
−s|−−snapshot
[−c|−−chunksize ChunkSize]
[−h|−?|−−help]
[−v|−−verbose]
[−Z|−−zero y|n] [−−version]
OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]
lvconvert will change a linear logical volume to a mirror logical volume or to a snapshot of linear volume and vice versa. It is also used to add and remove disk logs from mirror devices.
See lvm
for common options.
Exactly one of −−mirrors, −−repair
or −−snapshot arguments required.
−m, −−mirrors Mirrors
Specifies the degree of the mirror you wish to create. For example, "-m 1" would convert the original logical volume to a mirror volume with 2-sides; that is, a linear volume plus one copy.
−−mirrorlog {disk|core}
Specifies the type of log to use. The default is disk, which is persistent and requires a small amount of storage space, usually on a separate device from the data being mirrored. Core may be useful for short-lived mirrors: It means the mirror is regenerated by copying the data from the first device again every time the device is activated - perhaps, for example, after every reboot.
−−corelog
The optional argument "--corelog" is the same as specifying "--mirrorlog core".
−R, −−regionsize MirrorLogRegionSize
A mirror is divided into regions of this size (in MB), and the mirror log uses this granularity to track which regions are in sync.
−b, −−background
Run the daemon in the background.
−i, −−interval Seconds
Report progress as a percentage at regular intervals.
−−repair
Repair a mirror that has suffered a disk failure. The mirror will be brought back into a consistent state, and if possible, the original number of mirrors will be restored, if so desired. By default, lvconvert will prompt you whether to perform the replacement. If you instead wish to unconditionally replace missing devices, you may specify −y on the commandline and if you instead want no replacement to happen at all, you may provide −f. Additionally, you may use "--use-policies" - this option will use the device replacement policy specified in lvm.conf, specifically "activation/mirror_log_fault_policy" and "activation/mirror_device_fault_policy".
−s, −−snapshot
Create a snapshot from existing logical volume using another existing logical volume as its origin.
−c, −−chunksize ChunkSize
Power of 2 chunk size for the snapshot logical volume between 4k and 512k.
−Z, −−zero y|n
Controls zeroing of the first KB of data in the snapshot. If the volume is read-only the snapshot will not be zeroed.
"lvconvert
-m1 vg00/lvol1"
converts the linear logical volume "vg00/lvol1" to
a two-way mirror logical volume.
"lvconvert
--mirrorlog core vg00/lvol1"
converts a mirror with a disk log to a mirror with an
in-memory log.
"lvconvert
--mirrorlog disk vg00/lvol1"
converts a mirror with an in-memory log to a mirror with a
disk log.
"lvconvert
-m0 vg00/lvol1"
converts a mirror logical volume to a linear logical
volume.
"lvconvert
-s vg00/lvol1 vg00/lvol2"
converts logical volume "vg00/lvol2" to snapshot
of original volume "vg00/lvol1"
lvm(8), vgcreate(8), lvremove(8), lvrename(8), lvextend(8), lvreduce(8), lvdisplay(8), lvscan(8)
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lvconvert(8) | |