Re: MDS and stretched clusters

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Yes, with Rook this is possible by adding zone anti-affinity for the MDS
pods.

Travis

On Tue, Oct 29, 2024 at 3:35 PM Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:

> No, unfortunately this needs to be done at a higher level and is not
> included in Ceph right now. Rook may be able to do this, but I don't think
> cephadm does.
> Adam, is there some way to finagle this with pod placement rules (ie,
> tagging nodes as mds and mds-standby, and then assigning special mds config
> info to corresponding pods)?
> -Greg
>
> On Tue, Oct 29, 2024 at 12:46 PM Sake Ceph <ceph@xxxxxxxxxxx> wrote:
>
> > I hope someone of the development team can share some light on this. Will
> > search the tracker if some else made a request about this.
> >
> > > Op 29-10-2024 16:02 CET schreef Frédéric Nass <
> > frederic.nass@xxxxxxxxxxxxxxxx>:
> > >
> > >
> > > Hi,
> > >
> > > I'm not aware of any service settings that would allow that.
> > >
> > > You'll have to monitor each MDS state and restart any non-local active
> > MDSs to reverse roles.
> > >
> > > Regards,
> > > Frédéric.
> > >
> > > ----- Le 29 Oct 24, à 14:06, Sake Ceph ceph@xxxxxxxxxxx a écrit :
> > >
> > > > Hi all
> > > > We deployed successfully a stretched cluster and all is working fine.
> > But is it
> > > > possible to assign the active MDS services in one DC and the
> > standby-replay in
> > > > the other?
> > > >
> > > > We're running 18.2.4, deployed via cephadm. Using 4 MDS servers with
> 2
> > active
> > > > MDS on pinnend ranks and 2 in standby-replay mode.
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