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snapshot

Posted on 2014-02-19
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Last Modified: 2014-02-25
how lvm snapshot works? I noticed that

[root@rhel5 proc]# lvconvert --merge /dev/VolGroup00/rootsnap
  Can't merge over open origin volume
  Can't initialize snapshot merge. Missing support in kernel?
  Unable to merge LV "rootsnap" into its origin.
[root@rhel5 proc]#
[root@rhel5 proc]#
[root@rhel5 proc]#
[root@rhel5 proc]# lvs
  LV       VG         Attr   LSize  Origin   Snap%  Move Log Copy%  Convert
  LogVol00 VolGroup00 owi-ao 27.91G
  LogVol01 VolGroup00 -wi-ao  1.97G
  rootsnap VolGroup00 swi-a-  1.00G LogVol00  47.76
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Question by:ittechlab
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LVL 28

Expert Comment

by:Jan Springer
ID: 39873438
"To check if your kernel supports the snapshot  merge  feature,  look  for  ’snapshot-
merge’  in the output of dmsetup targets."
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Author Comment

by:ittechlab
ID: 39873481
[root@rhel5 ~]# dmsetup targets
multipath        v1.0.6
raid45           v1.0.0
snapshot-origin  v1.6.0
snapshot         v1.6.0
zero             v1.0.0
mirror           v1.2.0
striped          v1.1.0
linear           v1.0.2
error            v1.0.1
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Expert Comment

by:Jan Springer
ID: 39873499
It doesn't look like it supports merge.
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Author Comment

by:ittechlab
ID: 39873541
which version support snapshot merge
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Jan Springer earned 380 total points
ID: 39873575
It should be included in 2.6.33.
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Author Comment

by:ittechlab
ID: 39874953
when i take a snapshot what is really happening. can you give me some insight.
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Expert Comment

by:Jan Springer
ID: 39876785
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