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Date: Tue, 11 Feb 2014 11:06:27 +0100
From: Zdenek Kabelac <zkabelac@redhat.com>
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Subject: Re: [linux-lvm] Cancelling snapshot merge
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To: LVM general discussion and development <linux-lvm@redhat.com>

Dne 10.2.2014 14:14, Alexander Meshcheryakov napsal(a):
> Hello,
>
> 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 merge
>
>
> $ sudo lvcreate --size 2G --snapshot -n var_snap1 /dev/mapper/VolGroup00-LogVol01
>
>    Snapshots of an origin that has a merging snapshot is not supported
>
>
> Is there a way to cancel postponed snapshot merge?


vgcfgrestore  - you could go via archive to the previous state of metadata.

There is no support for merge aborting - since it might have other 'side' 
effects on metadata.

If you know what you are doing - vgcfgrestore is your rescue tool.

Zdenek