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man: lvceate document external origin snapshot

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Document added support for external origin.
This commit is contained in:
Zdenek Kabelac 2013-04-05 12:56:19 +02:00
parent ddafa0115e
commit c22e925ce4
2 changed files with 20 additions and 1 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.99 -
===================================
Add external origin support for lvcreate.
Improve lvcreate, lvconvert and lvm man pages.
Clean up format1 PV write to remove a need for an orphan VG for it to pass.
Fix vgextend to not allow a PV with 0 MDAs to be used while already in a VG.

20
man/lvcreate.8.in
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@ -59,7 +59,10 @@ lvcreate \- create a logical volume in an existing volume group
.RB [ \-\-poolmetadatasize
.IR ThinPoolMetadataSize [ bBsSkKmMgG ]]]
.RB [ \-\-thinpool
.IR ThinPoolLogicalVolume { Name | Path }]
.IR ThinPoolLogicalVolume { Name | Path }
.RB [ \-s | \-\-snapshot
.RI [ VolumeGroup { Name | Path }/]
.IR ExternalOriginLogicalVolumeName ]]
.RB [ \-\-type
.IR SegmentType ]
.RB [ \-v | \-\-verbose ]
@ -291,6 +294,15 @@ used to track the locations of the chunks of data, so you should
allocate slightly more space than you actually need and monitor
(\fB\-\-monitor\fP) the rate at which the snapshot data is growing
so you can \fBavoid\fP running out of space.
If \fB\-\-thinpool\fP is specified, thin volume is created that will
use given original logical volume as an external origin that
serves unprovisioned blocks.
Only read-only volumes can be used as external origins.
To make the volume external origin, lvm expects the volume to be inactive.
External origin volume can be used/shared for many thin volumes
even from different thin pools. See
.BR lvconvert (8)
for online conversion to thin volumes with external origin.
.TP
.IR \fB\-T ", " \fB\-\-thin ", " \fB\-\-thinpool " " ThinPoolLogicalVolume { Name | Path }
Creates thin pool or thin logical volume or both.
@ -407,9 +419,15 @@ build with 2 stripes 64KiB and chunk size 256KiB together with
.sp
.B lvcreate \-i 2 \-I 64 \-c 256 \-L100M \-T vg00/pool \-V 1T \-\-name thin_lv
Creates thin volume snapshot of read only inactive volume "vg00/origin"
that will use an existing thin pool "vg00/pool":
.sp
.B lvcreate -s --thinpool "vg00/pool" origin
.SH SEE ALSO
.BR lvm (8),
.BR lvm.conf (5),
.BR lvconvert (8),
.BR lvchange (8),
.BR lvextend (8),
.BR lvreduce (8),