I used  to have a similar issue and when I live migrated  (from 1  host to another)  it  automatically completed.

Best Regards,
Strahil Nikolov

На 27 май 2020 г. 17:39:36 GMT+03:00, Benny Zlotnik <bzlotnik@redhat.com> написа:
>Sorry, by overloaded I meant in terms of I/O, because this is an
>active layer merge, the active layer
>(aabf3788-8e47-4f8b-84ad-a7eb311659fa) is merged into the base image
>(a78c7505-a949-43f3-b3d0-9d17bdb41af5), before the VM switches to use
>it as the active layer. So if there is constantly additional data
>written to the current active layer, vdsm may have trouble finishing
>the synchronization
>
>
>On Wed, May 27, 2020 at 4:55 PM David Sekne <david.sekne@gmail.com>
>wrote:
>>
>> Hello,
>>
>> Yes, no problem. XML is attached (I ommited the hostname and IP).
>>
>> Server is quite big (8 CPU / 32 Gb RAM / 1 Tb disk) yet not
>overloaded. We have multiple servers with the same specs with no
>issues.
>>
>> Regards,
>>
>> On Wed, May 27, 2020 at 2:28 PM Benny Zlotnik <bzlotnik@redhat.com>
>wrote:
>>>
>>> Can you share the VM's xml?
>>> Can be obtained with `virsh -r dumpxml <vm_name>`
>>> Is the VM overloaded? I suspect it has trouble converging
>>>
>>> taskcleaner only cleans up the database, I don't think it will help
>here
>>>
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