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It sounds like the extra specs you configured are not selective enough. Can
you post up your 3 cinder.conf files from the c-vol nodes, and the commands
used to create the volume type, please?
On 13 Jul 2015 08:00, "Eduard Matei" <eduard.matei at cloudfounders.com> wrote:

> Hi,
>
> Forgot to mention, indeed we configured extra_specs: volume_backend_name.
> The problem is that a volume of this type can get scheduled on a node
> where c-vol is not configured with this backend.
>
> F.e.: I have 3 storage nodes (c-vol) and two have the driver configured,
> the third one doesn't have it; when i try to create a volume of this type,
> sometimes the c-vol on third node gets the call, and it fails because the
> driver is not configured.
>
> Maybe we didn't configure something properly, i tried looking at c-sch but
> i can't figure out why the third node got chosen.
>
> Thanks,
>
> Eduard
>
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