Hi,

Pardon me for jumping in subj, but...

Could you explain me in a few words or give a link where to read about "split-brain"?

I made a lab: cluster (virt and gluster services both) based on two server. With this options:
cluster.server-quorum-type none
cluster.quorum-type fixed
cluster.quorum-count 1

I get a cluster that worked just fine even with only one host alive.

I have run VM on a not SPM host B, have made some files, then on the SPM host A have stoped network service (host has gone, no power management), have made some huge files on the VM again, after that I have rebooted manualy the host A and there was no unexpected result. VM have worked without problem, I have rebooted the VM several times and there were no problems with any files I have made before.

I want to build a cluster with only two hosts, because I have only two good servers free, and only 8x3TB HDD (for RAID10 in each host). To get one more server and 4HDD is unbelievable in a close future..

Thanks.

2015-06-03 16:54 GMT+03:00 Simone Tiraboschi <stirabos@redhat.com>:

----- Original Message -----
> From: "Kiril L" <neohidra@gmail.com>
> To: users@ovirt.org
> Sent: Wednesday, June 3, 2015 3:32:52 PM
> Subject: [ovirt-users] Is it a plausible configuration?
>
> Would you please tell me if this configuration is doable or there is
> something that i am missing?
>
> I would like to use only two servers (X and Y) for VDI and Gluster
> based storage.
> Hosted engine for oVirt and replicated volumes between X and Y for the
> gluster storage. Is a third machine Z a must?

It works also with just two hosts but it's not that safe: a replica-2 GlusterFS volume affected by a split-brain issue could be not self-healing while with replica-3 you could rely on quorum enforcement just cause you are using an odd host number.

For oVirt 3.6 we are working on http://www.ovirt.org/Features/Self_Hosted_Engine_Hyper_Converged_Gluster_Support

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