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Hi Gorka, let me show the cinder config:

[ceph-rbd]
rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_user = cinder
backend_host = rbd:volumes
rbd_pool = cinder.volumes
volume_backend_name = ceph-rbd
volume_driver = cinder.volume.drivers.rbd.RBDDriver
…

So, using rbd_exclusive_cinder_pool=True it will be used just for volumes? but the log is saying no connection to the backend_host.

Regards. 


> On 12 May 2021, at 11:49, Gorka Eguileor <geguileo at redhat.com> wrote:
> 
> On 12/05, ManuParra wrote:
>> 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.
>> 
> 
> Hi,
> 
> You are most likely using an older release, have a high number of cinder
> RBD volumes, and have not changed configuration option
> "rbd_exclusive_cinder_pool" from its default "false" value.
> 
> Please add to your driver's section in cinder.conf the following:
> 
> rbd_exclusive_cinder_pool = true
> 
> 
> And restart the service.
> 
> Cheers,
> Gorka.
> 
>>> 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.
>>> 
>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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