On Fri, Sep 15, 2017 at 5:48 PM, Alex K <rightkicktech@gmail.com> wrote:

In the replica 3 + 1 arbiter does this mean that if I loose the two nodes having the normal volumes and left only with the node that has the arbiter volume, I loose all data?

Yes!
 

Thanx,

Alex

On Fri, Sep 15, 2017 at 11:25 AM, Kasturi Narra <knarra@redhat.com> wrote:

Hi ,

   yes, you are right. Since arbiter brick  has only metadata and  data for the vm has to be served from one of the other two replicas, read is slow. 

    Arbiter is a special subset of replica 3 volumes and is aimed at preventing split-brains and providing same consistency as a normal replica 3 volume with out consuming 3x space. You could use replica 3 and no issues with that.

Thanks

kasturi

On Fri, Sep 15, 2017 at 12:41 PM, Abi Askushi <rightkicktech@gmail.com> wrote:

Hi all,

I see in the ovirt guides that a gluster volume replica 3 with 1 arbiter is recommended.

Why not simple replica 3? Is it due to the higher replication data that would cause performance issues?

What I am observing is that a VM running on the server which has the arbiter brick has slower read performance then when the same VM runs on another server with a normal brick. Has anyone observed this? Is it because the arbiter does not have the real data on it?

Thanx,

Alex

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