Do you have the logs (engine.log, vdsm.log) for this?
qemu-nbd holding the lock might mean the transfer was not finalized
properly and the nbd server was left open which should not happen...

On Wed, Aug 31, 2022 at 1:57 PM Diego Ercolani <diego.ercol...@ssis.sm> wrote:
>
> Thanks Arik,
> we have tried your solution but with no successful results.
> we have gather also other infor and combined in this solution:
>
> we have deleted on DB the row on vm_backups and vm_disk_map related to the 
> hanged backup.
>
> The we have tried to delete shapshot locked , after the row db deletion the 
> messange "cannot delete shapshot during backup operations" does not apper" 
> but deletion failed anyway.
>
> so we watch the log file /var/log/ovirt-engine/engine.log ans see this 
> messages
>
> nIs another process using the image [
>  
> /rhev/data-center/mnt/glusterSD/localhost:_gv0/60b7f172-08ed-4a22-8414-31fd5b100d72/images/5d18a058-652f-4c94-a9ff-9c15152c61b4/f17c3443-b62f-43f5-b35c-5ba9225abaf4
>
> then we search on the node which process olds the file with the command:
>
> lsof | grep f17c3443-b62f-43f5-b35c-5ba9225abaf4
>
> and we found on a node that the file was in use by a process qemu-ndb
>
> we kill that process and finally we were enabled to delete the shapshot.
>
>
> Thanks again for your support
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