[ovirt-users] Is it a plausible configuration?

[Юрий Полторацкий]

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 at redhat.com>:

>
>
> ----- Original Message -----
> > From: "Kiril L" <neohidra at gmail.com>
> > To: users at 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
>
>
> > _______________________________________________
> > Users mailing list
> > Users at ovirt.org
> > http://lists.ovirt.org/mailman/listinfo/users
> >
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