[Gluster-users] High-availability with KVM?

[Ziemowit Pierzycki]

I see.  So if I switch to a different cluster quorum model, I may get
split-brain which would need manual intervention should a node go
missing?

Adding an arbiter involves creating a volume from scratch?  You can't
just add it to an existing volume.

On Fri, Jan 20, 2017 at 2:52 PM, Gambit15 <dougti+gluster at gmail.com> wrote:
>> Type: Distributed-Replicate
>> Number of Bricks: 2 x 2 = 4
>
>
> With that setup, you lose quorum if you lose any one node.
> Brick 1 replicates to brick 2, and brick 3 replicates to brick 4. If any one
> of those goes down, quorum falls to <51%, which locks the brick under the
> default settings.
>
> If you've only got 4 servers to play with, I suggest you move to replication
> 3 arbiter 1. Put the arbiter for servers 1 & 2 on server 3, and the arbiter
> for servers 3 & 4 on server 1.
>
> https://gluster.readthedocs.io/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/
>