From: "Kiril L" <neohidra(a)gmail.com&gt; To: users(a)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?

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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(a)redhat.com&gt;: > > > > ----- Original Message ----- > > From: "Kiril L" <neohidra(a)gmail.com&gt; > > To: users(a)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_... > > > > _______________________________________________ > > Users mailing list > > Users(a)ovirt.org > > http://lists.ovirt.org/mailman/listinfo/users > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users