It's not the most elegant or guaranteed to fix your issue, but I've found that running engine-setup again on the hosted-engine server usually cleans up broken and orphaned tasks.

Any running VM's will stay up, you'll just briefly loose access to the UI while engine-setup restarts the interface.

On 26 September 2017 at 13:36, <nicolas@devels.es> wrote:
In the engine.log I can see this:

2017-09-26 13:35:33,345+01 INFO  [org.ovirt.engine.core.bll.tasks.AsyncTaskManager] (DefaultQuartzScheduler7) [6a4aa90c] Polling and updating Async Tasks: 2 tasks, 1 tasks to poll now
2017-09-26 13:35:34,500+01 INFO  [org.ovirt.engine.core.bll.storage.domain.DeactivateStorageDomainWithOvfUpdateCommand] (default task-37) [2ec47109-db9d-425c-85fc-ee555e7dc4db] Lock Acquired to object 'EngineLock:{exclusiveLocks='[42222886-cee8-47ba-a679-16a7db522779=STORAGE]', sharedLocks='[75bf8f48-970f-42bc-8596-f8ab6efb2b63=POOL]'}'
2017-09-26 13:35:34,580+01 WARN  [org.ovirt.engine.core.bll.storage.domain.DeactivateStorageDomainWithOvfUpdateCommand] (default task-37) [2ec47109-db9d-425c-85fc-ee555e7dc4db] Validation of action 'DeactivateStorageDomainWithOvfUpdate' failed for user admin@internal. Reasons: VAR__TYPE__STORAGE__DOMAIN,VAR__ACTION__DEACTIVATE,ERROR_CANNOT_DEACTIVATE_DOMAIN_WITH_TASKS
2017-09-26 13:35:34,581+01 INFO  [org.ovirt.engine.core.bll.storage.domain.DeactivateStorageDomainWithOvfUpdateCommand] (default task-37) [2ec47109-db9d-425c-85fc-ee555e7dc4db] Lock freed to object 'EngineLock:{exclusiveLocks='[42222886-cee8-47ba-a679-16a7db522779=STORAGE]', sharedLocks='[75bf8f48-970f-42bc-8596-f8ab6efb2b63=POOL]'}'
2017-09-26 13:35:36,440+01 INFO  [org.ovirt.engine.core.bll.tasks.AsyncTaskManager] (DefaultQuartzScheduler7) [6a4aa90c] Finished polling Tasks, will poll again in 10 seconds.


El 2017-09-26 13:34, nicolas@devels.es escribió:
Hi,

We're running ovirt-engine-4.1.5.2-1 and we're trying to set one of
the storage domains on maintenance in order to remove it, as there's
nothing left on it besides some templates.

To do so, I open the 'Data Centers' tab, then the 'Storage' subtab,
select the storage domain and click on 'Maintenance'. When asked for
confirmation I click OK. After that, this error message is shown:

Error while executing action: Cannot deactivate Storage while there
are running tasks on this Storage.
-Please wait until tasks will finish and try again.

As far as I know, there are no pending tasks on this storage. The
Events tab only shows a movement of a disk which has nothing to do
with this storage domain.

What can I do to solve this?

Thanks.

Nicolás
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