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

[Strahil Nikolov]

And  whatabout SBD (a.k.a. poison pill).  I've used it reliably with 3  SBDs  on a streched  cluster. Neverr failed  to kill  the node.

Best Regards,
Strahil Nikolov

На 14 юли 2020 г. 14:18:56 GMT+03:00, Rohit Saini <rohitsaini111.forum at gmail.com> написа:
>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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>> >>
>> >
>>
>>