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Thanks, I have restarted the service and I see that after a few minutes then cinder-volume service goes down again when I check it with the command openstack volume service list. 
The host/service that contains the cinder-volumes is rbd:volumes at ceph-rbd that is RDB in Ceph, so the problem does not come from Cinder, rather from Ceph or from the RDB (Ceph) pools that stores the volumes. I have checked Ceph and the status of everything is correct, no errors or warnings. 
The error I have is that cinder can’t  connect to rbd:volumes at ceph-rbd. Any further suggestions? Thanks in advance.
Kind regards.

> On 11 May 2021, at 22:30, Eugen Block <eblock at nde.ag> wrote:
> 
> Hi,
> 
> so restart the volume service;-)
> 
> systemctl restart openstack-cinder-volume.service
> 
> 
> Zitat von ManuParra <mparra at iaa.es>:
> 
>> Dear OpenStack community,
>> 
>> I have encountered a problem a few days ago and that is that when creating new volumes with:
>> 
>> "openstack volume create --size 20 testmv"
>> 
>> the volume creation status shows an error.  If I go to the error log detail it indicates:
>> 
>> "Schedule allocate volume: Could not find any available weighted backend".
>> 
>> Indeed then I go to the cinder log and it indicates:
>> 
>> "volume service is down - host: rbd:volumes at ceph-rbd”.
>> 
>> I check with:
>> 
>> "openstack volume service list”  in which state are the services and I see that indeed this happens:
>> 
>> 
>> | cinder-volume | rbd:volumes at ceph-rbd | nova | enabled | down | 2021-04-29T09:48:42.000000 |
>> 
>> And stopped since 2021-04-29 !
>> 
>> I have checked Ceph (monitors,managers, osds. etc) and there are no problems with the Ceph BackEnd, everything is apparently working.
>> 
>> This happened after an uncontrolled outage.So my question is how do I restart only cinder-volumes (I also have cinder-backup, cinder-scheduler but they are ok).
>> 
>> Thank you very much in advance. Regards.
> 
> 
> 
>