[ovirt-users] GlusterFS distributed replicated with arbiter on 4 nodes - settings

Hi Guys, I would like to use GlusterFS distributed-replicated with arbiter volume on 4 nodes for oVirt. Can you tell me what tuning parameters should I set for such volume for best VM performance? Does it make any sense to upgrade from Glusterfs 3.12 to 4.1 or even 5.0? Thanks! Jarek