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

[Jan Friesse]

Rohit,

> Also, " Keep in mind that neither qdevice nor booth is "replacement" for
> stonith.  "
> 
> Why not? qdevice/booth are handling the split-brain scenario, keeping one
> master only even in case of local/geo network disjoints. Can you please
> clarify more on this.

Yeah, you are right. I don't really want to go to much deeps of this 
discussion, because opinions there seems to be like emacs/vi wars. Let's 
say I'm standing more on "stonith (ideally HW) as a hard requirement" side.

Honza


> 
> Thanks,
> Rohit
> 
> On Tue, Jul 14, 2020 at 3:40 PM Rohit Saini <rohitsaini111.forum at gmail.com>
> wrote:
> 
>> Thanks Honja. That's helpful.
>> Let's say I don't use qnetd, can I achieve same with booth arbitrator?
>> Booth arbitrator works for geo-clusters, can the same arbitrator be reused
>> for local clusters as well?
>> Is it even possible technically?
>>
>> 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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>>>
>