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Thin extend lvcreate man page about snapshot support

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This commit is contained in:
Zdenek Kabelac 2012-01-20 10:50:39 +00:00
parent cf22ba1971
commit 3486e8332d
1 changed files with 9 additions and 8 deletions
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17
man/lvcreate.8.in
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@ -81,9 +81,7 @@ lvcreate \- create a logical volume in an existing volume group
.RB [ \-n | \-\-name
.IR SnapshotLogicalVolume { Name | Path }]
.BR \-s | \-\-snapshot
.RI { OriginalLogicalVolume { Name | Path }
|
.IR VolumeGroup { Name | Path }
.RI {[ VolumeGroup { Name | Path }/] OriginalLogicalVolumeName
.BR \-V | \-\-virtualsize
.IR VirtualSize [ bBsSkKmMgGtTpPeE ]}
.br
@ -241,16 +239,19 @@ a suitable value automatically.
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.
.TP
.IR \fB\-s ", " \fB\-\-snapshot " " OriginalLogicalVolume { Name | Path }
.RI "| " VolumeGroup { Name | Path }
.IR \fB\-s ", " \fB\-\-snapshot " " OriginalLogicalVolume { Name | Path }
Create a snapshot logical volume (or snapshot) for an existing, so called
original logical volume (or origin).
Snapshots provide a 'frozen image' of the contents of the origin
while the origin can still be updated. They enable consistent
backups and online recovery of removed/overwritten data/files. The snapshot
does not need the same amount of storage the origin has. In a typical scenario,
15-20% might be enough. In case the snapshot runs out of storage, use
backups and online recovery of removed/overwritten data/files.
Thin snapshot is created when the origin is a thin volume and
the size is not specified. Thin snapshot shares same blocks within
the thin pool volume.
The snapshot with the specified size does not need the same amount of
storage the origin has. In a typical scenario, 15-20% might be enough.
In case the snapshot runs out of storage, use
.BR lvextend (8)
to grow it. Shrinking a snapshot is supported by
.BR lvreduce (8)