On Tue, Jul 14, 2020 at 5:37 PM Arsène Gschwind
<arsene.gschw...@unibas.ch> wrote:
>
> Hi,
>
> I running oVirt 4.3.9 with FC based storage.
> I'm running several VM with 3 disks on 3 different SD. Lately we did delete a 
> VM Snapshot and that task failed after a while and since then the Snapshot is 
> inconsistent.
> disk1 : Snapshot still visible in DB and on Storage using LVM commands
> disk2: Snapshot still visible in DB but not on storage anymore (It seems the 
> merge did run correctly)
> disk3: Snapshot still visible in DB but not on storage ansmore (It seems the 
> merge did run correctly)
>
> When I try to delete the snapshot again it runs forever and nothing happens.

Did you try also when the vm is not running?

In general the system is designed so trying again a failed merge will complete
the merge.

If the merge does complete, there may be some bug that the system cannot
handle.

> Is there a way to suppress that snapshot?
> Is it possible to merge disk1 with its snapshot using LVM commands and then 
> cleanup the Engine DB?

Yes but it is complicated. You need to understand the qcow2 chain
on storage, complete the merge manually using qemu-img commit,
update the metadata manually (even harder), then update engine db.

The best way - if the system cannot recover, is to fix the bad metadata
that cause the system to fail, and the let the system recover itself.

Which storage domain format are you using? V5? V4?

> Thanks for any hint or help.
> rgds , arsene
>
> --
>
> Arsène Gschwind <arsene.gschw...@unibas.ch>
> Universitaet Basel
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