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Thank you, Sean.

> have you enabled  
> https://docs.openstack.org/nova/latest/configuration/config.html#workarounds.ensure_libvirt_rbd_instance_dir_cleanup

No, this is not enabled in our environment, it's still the default "false".


Zitat von Sean Mooney <smooney at redhat.com>:

> On Mon, 2021-03-22 at 09:39 +0000, Eugen Block wrote:
>> Hi *,
>>
>> I stumbled across a different issue when I noticed there's a
>> <UUID>_del directory in /var/lib/nova/instances/. It's a shared
>> directory to enable live-migration. I noticed these "_del" directories
>> before but I didn't really investigate, everything seems to work as
>> expected. But I would like to understand what exactly happens with
>> such a directory, for example currently there's just one instance
>> having also a _del directory. The timestamp is from 2 years ago when
>> the instance was resized the first time. Looking in the nova code [1]
>> I found the reference to the resize function, I just don't quite
>> understand what would happen with that instance if it was shutdown.
>>
>> Would nova delete it to "clean up"?
>> Can I remove that directory safely to prevent nova from doing anything
>> destructive to that instance?
>>
>> I'd appreciate any insights about this. Just to be safe I created an
>> RBD snapshot of the disk to prevent a deletion.
> have you enabled  
> https://docs.openstack.org/nova/latest/configuration/config.html#workarounds.ensure_libvirt_rbd_instance_dir_cleanup
>>
>> Best regards,
>> Eugen
>>
>> [1]
>> https://opendev.org/openstack/nova/src/commit/146b27f22327f8d60c1017c22ccf18d0e16f1eb7/nova/virt/libvirt/driver.py#L7725
>>
>>
>>