[Gluster-users] Is "replica 4 arbiter 1" allowed to tweak client-quorum?

[Karthik Subrahmanya]

Hi,

I guess you missed Ravishankar's reply [1] for this query, on your previous
thread.
[1] https://lists.gluster.org/pipermail/gluster-users/2019-April/036247.html

Regards,
Karthik

On Wed, Apr 10, 2019 at 8:59 PM Ingo Fischer <ingo at fischer-ka.de> wrote:

> Hi All,
>
> I had a replica 2 cluster to host my VM images from my Proxmox cluster.
> I got a bit around split brain scenarios by using "nufa" to make sure
> the files are located on the host where the machine also runs normally.
> So in fact one replica could fail and I still had the VM working.
>
> But then I thought about doing better and decided to add a node to
> increase replica and I decided against arbiter approach. During this I
> also decided to go away from nufa to make it a more normal approach.
>
> But in fact by adding the third replica and removing nufa I'm not really
> better on availability - only split-brain-chance. I'm still at the point
> that only one node is allowed to fail because else the now active client
> quorum is no longer met and FS goes read only (which in fact is not
> really better then failing completely as it was before).
>
> So I thought about adding arbiter bricks as "kind of 4th replica (but
> without space needs) ... but then I read in docs that only "replica 3
> arbiter 1" is allowed as combination. Is this still true?
> If docs are true: Why arbiter is not allowed for higher replica counts?
> It would allow to improve on client quorum in my understanding.
>
> Thank you for your opinion and/or facts :-)
>
> Ingo
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