FYI: after upgrading to ovirt 4.4.5 (both manager and ovirt nodes) the
issue seems fixed (or at least it didn't happen in about a week, with
4.4.4 I had the problem every couple of day).

Regards,
gc


On 04/02/2021 09:08, Giulio Casella wrote:
> I've not been able to reproduce, if happens again I'll submit a bugzilla.
> 
> Thank you.
> 
> Regards,
> gc
> 
> 
> On 03/02/2021 17:49, Shani Leviim wrote:
>> In such a case, the disks shouldn't remain locked - sounds like a bug.
>> This one requires a deeper look.
>> If you're able to reproduce it again, please open a bug in Bugzilla
>> (https://bugzilla.redhat.com <https://bugzilla.redhat.com>) with engine
>> and vdsm logs,
>> so we'll be able to investigate it.
>>
>> *Regards,
>> *
>> *Shani Leviim
>> *
>>
>>
>> On Wed, Feb 3, 2021 at 5:39 PM Giulio Casella <giu...@di.unimi.it
>> <mailto:giu...@di.unimi.it>> wrote:
>>
>>     Hi,
>>     I tried unlock_entity.sh, and it solved the issue. So far so good.
>>
>>     But it's still unclear why disks were locked.
>>
>>     Let me make an hypothesis: in ovirt 4.3 a failure in snapshot removal
>>     would lead to a snapshot in illegal status. No problem, you can remove
>>     again and the situation is fixed.
>>     In ovirt 4.4 a failure in snapshot removal leave the whole disk in
>>     locked state (maybe a bug?), preventing any further action.
>>
>>     Does it make sense?
>>
>>
>>     On 03/02/2021 12:25, Giulio Casella wrote:
>>     > Hi Shani,
>>     > no tasks listed in UI, and now "taskcleaner.sh -o" reports no task
>>     (just
>>     > before I gave "taskcleaner.sh -r").
>>     > But disks are still locked, and "unlock_entity.sh -q -t all -c"
>>     > (accordingly) reports only two disk's uuid (with their vm's uuid).
>>     >
>>     > Time to give a chance to unlock_entity.sh?
>>     >
>>     > Regards,
>>     > gc
>>     >
>>     > On 03/02/2021 11:52, Shani Leviim wrote:
>>     >> Hi Giulio,
>>     >> Before running unlock_entity.sh, let's try to find if there's any
>>     task
>>     >> in progress.
>>     >> Is there any hint on the events in the UI?
>>     >> Or try to run [1]:
>>     >> ./taskcleaner.sh -o  
>>     >>
>>     >> Also, you can verify what entities are locked [2]:
>>     >> ./unlock_entity.sh -q -t all -c
>>     >>
>>     >> [1]
>>     >>
>>     
>> https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/taskcleaner.sh
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/taskcleaner.sh>
>>     >>
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/taskcleaner.sh
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/taskcleaner.sh>>
>>     >> [2]
>>     >>
>>     
>> https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/unlock_entity.sh
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/unlock_entity.sh>
>>     >>
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/unlock_entity.sh
>>     
>> <https://github.com/oVirt/ovirt-engine/blob/master/packaging/setup/dbutils/unlock_entity.sh>>
>>     >>
>>     >> *Regards,
>>     >> *
>>     >> *Shani Leviim
>>     >> *
>>     >>
>>     >>
>>     >> On Wed, Feb 3, 2021 at 10:43 AM Giulio Casella
>>     <giu...@di.unimi.it <mailto:giu...@di.unimi.it>
>>     >> <mailto:giu...@di.unimi.it <mailto:giu...@di.unimi.it>>> wrote:
>>     >>
>>     >>     Since yesterday I found a couple VMs with locked disk. I
>>     don't know the
>>     >>     reason, I suspect some interaction made by our backup system
>>     (vprotect,
>>     >>     snapshot based), despite it's working for more than a year.
>>     >>
>>     >>     I'd give a chance to unlock_entity.sh script, but it reports:
>>     >>
>>     >>     CAUTION, this operation may lead to data corruption and
>>     should be used
>>     >>     with care. Please contact support prior to running this command
>>     >>
>>     >>     Do you think I should trust? Is it safe? VMs are in production...
>>     >>
>>     >>     My manager is 4.4.4.7-1.el8 (CentOS stream 8), hosts are
>>     oVirt Node
>>     >>     4.4.4
>>     >>
>>     >>
>>     >>     TIA,
>>     >>     Giulio
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