Restart cinder-volume with Ceph rdb

ManuParra mparra at
Tue May 11 16:57:59 UTC 2021

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.

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