Open Stack

On 02/04, Ignazio Cassano wrote:
> In other words, when you disable a cinder backend you cannot allocate
> volumes on it.
> This is what you want.
> Ignazio
>

Hi,

A clarification for anyone reading this, please pay careful attention to
Ignazio's wording, it's important: "cannot allocate volumes".

Just because Cinder won't allocate new volumes it doesn't mean that all
operations on the backend are disabled.  In fact, scheduling operations
are disabled and everything else isn't.

This means that volumes can be deleted, they can be attached, snapshot
can be deleted, backups can be created...

Cheers,
Gorka.


>
> Il Dom 2 Apr 2023, 18:10 Ignazio Cassano <ignaziocassano at gmail.com> ha
> scritto:
>
> > If you read the link I sent you, you can note that it disable a backend
> > before removing it. So you can exclude the removing section.
> > Another way can be excluding the backend from enabled backends in
> > cinder.conf and restarting cinser services.
> > Ignazio
> >
> > Il Dom 2 Apr 2023, 15:17 wodel youchi <wodel.youchi at gmail.com> ha scritto:
> >
> >> Thank you,
> >>
> >> Maybe my question was not clear enough.
> >> Let's say I have a  cinder-volume with nfs as backend and I need to take
> >> down the nfs server for maintenance, can I put the cinder-volume-nfs into
> >> some sort of maintenance mode, work on the nfs server bring it back, then
> >> reactivate the cinder-volume-nfs?
> >>
> >> Regards.
> >>
> >> Le dim. 2 avr. 2023 à 13:54, Ignazio Cassano <ignaziocassano at gmail.com>
> >> a écrit :
> >>
> >>> Or using the openstack command :
> >>>
> >>> https://platform9.com/kb/openstack/deleting-a-cinder-service-from-host
> >>>
> >>> Il Dom 2 Apr 2023, 14:46 wodel youchi <wodel.youchi at gmail.com> ha
> >>> scritto:
> >>>
> >>>> Hi,
> >>>>
> >>>> When you have multiple cinder backends, and you need to take down one
> >>>> of them for maintenance purposes, what is the best way to proceed?
> >>>> Does Openstack have the notion of : cinder backend in maintenance mode?
> >>>>
> >>>> Regards.
> >>>>
> >>>