[ovirt-users] Recommended gluster setup

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