[ClusterLabs] qnetd and booth arbitrator running together in a 3rd geo site

[Rohit Saini]

I dont think my question was very clear. I am strictly NO for STONITH.
STONITH is limited only for kvm or HP machines. That's the reason I don't
want to use STONITH.
What my question is can I use booth with nodes of a single cluster also
(similar to qdevice)? So idea is to use booth arbitrator for cluster of
clusters AS WELL AS for a single cluster.


On Tue, Jul 14, 2020 at 4:42 PM Jan Friesse <jfriesse at redhat.com> wrote:

> Rohit,
>
> > Thanks Honja. That's helpful.
> > Let's say I don't use qnetd, can I achieve same with booth arbitrator?
>
> That means to have two two-node clusters. Two-node cluster without
> fencing is strictly no.
>
> > Booth arbitrator works for geo-clusters, can the same arbitrator be
> reused
> > for local clusters as well?
>
> I'm not sure that I understand question. Booth just gives ticket to
> (maximally) one of booth-sites.
>
>
> > Is it even possible technically?
>
> The question is, what you are trying to achieve. If geo-cluster then
> stonith for sites + booth is probably best solution. If the cluster is
> more like a stretch cluster, then qnetd + stonith is enough.
>
> And of course your idea (original one) should work too.
>
> Honza
>
>
> >
> > Regards,
> > Rohit
> >
> > On Tue, Jul 14, 2020 at 3:32 PM Jan Friesse <jfriesse at redhat.com> wrote:
> >
> >> Rohit,
> >>
> >>> Hi Team,
> >>> Can I execute corosync-qnetd and booth-arbitrator on the same VM in a
> >>> different geo site? What's the recommendation? Will it have any
> >> limitations
> >>> in a production deployment?
> >>
> >> There is no technical limitation. Both qnetd and booth are very
> >> lightweight and work just fine with high latency links.
> >>
> >> But I don't really have any real-life experiences with deployment where
> >> both booth and qnetd are used. It should work, but I would recommend
> >> proper testing - especially what happens when arbitrator node
> disappears.
> >>
> >>> Due to my architecture limitation, I have only one arbitrator available
> >>> which is on a 3rd site. To handle cluster split-brain errors, I am
> >> thinking
> >>> to use same arbitrator for local cluster as well.
> >>> STONITH is not useful in my case as it is limited only to ILO and VIRT.
> >>
> >> Keep in mind that neither qdevice nor booth is "replacement" for
> stonith.
> >>
> >> Regards,
> >>     Honza
> >>
> >>>
> >>> [image: image.png]
> >>>
> >>> Thanks,
> >>> Rohit
> >>>
> >>>
> >>>
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> >>
> >>
> >
>
>
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