[ovirt-users] 4-node oVirt with replica-3 gluster

Davide Ferrari davide at billymob.com
Fri Sep 23 13:39:16 UTC 2016

2016-09-23 13:50 GMT+02:00 Sahina Bose <sabose at redhat.com>:

Ok, if I encounter again similiar problems I will post logs here

> If you have additional capacity on the other 3 hosts , then yes, you can
> create a new gluster volume with a brick on the newly added 4th node and
> bricks from other nodes - this volume can be used as another storage
> domain. You are not doing anything wrong :) Keep in mind that all gluster
> volumes used as data storage domains should be replica 3 or replica 3
> -arbiter to avoid split-brain and data loss issues.
Mmmmh this is ringing an alarm bell then. So, it's basically impossible (or
at least not supported) a 4 hosts configuration with all the 4 hosts having
a data domain in a replica 2 fashion? Is it only replica 3 arbiter 1 the
supported HA configuration? So if I want to expand storage (a part from
adding disks to the same machines) I must add machines 3 by 3 ?

Currently I have 4 machines with 4 disks each in a RAID-10 configuration,
exposed as one brick. Which is the best HA solution in this scenario then?


Davide Ferrari
Senior Systems Engineer
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