[linux-lvm] Cancelling snapshot merge

Alexander Meshcheryakov alexander.s.m at gmail.com
Mon Feb 10 13:14:21 UTC 2014


I had created snapshot of my /var logical volume a while ago and recently
It occured to me that I don't need saved state anymore and I would like to
reclaim disk space. But I have issued wrong lvconvert --merge command by
mistake instead of proper lvremove.

$ sudo lvconvert --merge VolGroup00/var_snap0
  Can't merge over open origin volume
  Merging of snapshot var_snap0 will start next activation.

I have figured out at this point that I made mistake. Luckily merge is
postponed as volume is used (mounted) now. But how do I prevent merge from
running upon next reboot? Here is what I have tried:

$ sudo lvremove VolGroup00/var_snap0
  Can't remove merging snapshot logical volume "var_snap0"

$ sudo lvchange -an VolGroup00/var_snap0
Change of snapshot var_snap0 will also change its origin LogVol01. Proceed?
[y/n]: n
  Logical volume var_snap0 not changed.

I even could not create snapshot of current state to roll back to it after

$ sudo lvcreate --size 2G --snapshot -n var_snap1

  Snapshots of an origin that has a merging snapshot is not supported

Is there a way to cancel postponed snapshot merge?
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