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

Reading the glusterfs docs https://gluster.readthedocs.io/en/latest/Administrator% 20Guide/arbiter-volumes-and-quorum/ "In a replica 3 volume, client-quorum is enabled by default and set to 'auto'. This means 2 bricks need to be up for the writes to succeed. Here is how this configuration prevents files from ending up in split-brain:" So this means that if one of the machines with the 2 bricks (arbiter & normal) fails, the otherbrick will be set RO, or am I missing something? I mean, this config will be better in case of a network loss, and thus a split brain, but it's far worse in case of a machine failing or being rebooted for maintenance.

2016-09-23 16:11 GMT+02:00 Davide Ferrari <davide(a)billymob.com&gt;: > > > 2016-09-23 15:57 GMT+02:00 Sahina Bose <sabose(a)redhat.com&gt;: > >> >> You could do this - where Node3 & Node 2 also has arbiter bricks. >> Arbiter bricks only store metadata and requires very low storage capacity >> compared to the data bricks. >> >> Node1 Node2 Node3 Node4 >> brick1 brick1 arb-brick >> arb-brick brick1 brick1 >> > > Ok, cool! And this won't pose any problem if Node2 or Node4 fail? > > The syntax shuld be this: > > gluster volume create data replica 3 arbiter 1 node1:/brick node2:/brick > node2:/arb_brick node3:/brick node4:/brick node4:/arb_brick > > is not a problem having more than a brick on the same host for the volume > create syntax? > > Thanks again > > -- > Davide Ferrari > Senior Systems Engineer > -- Davide Ferrari Senior Systems Engineer