Knowledge transfer from Wayne: https://drupal.star.bnl.gov/STAR/blog/wbetts/online-gluster-and-ovirt-expansion

Problem: Presently Gluster is configured with Distributed-Replica Volume using oVirt nodes 1,2, and 4.
oVirt Engine on oVirt 1, dean on ovirt 2
Replication: 3 * (2+1) => 3 replications on each node, 2 actual data vol and 1 arbiter

When we try to expand:

• Gluster expects a new set of 3 bricks matching the same structure (2 + 1)

• But there’s no built-in logic to automate arbiter awareness during volume expansion

Options:

1. Wayne suggests: Promote arbiter to full replica 3*3 using these instructions: https://lists.gluster.org/pipermail/gluster-users/2018-July/034385.html
Check for any space issues? If not, are there any uses of arbiter v/s full replica? May not be safe conversion..

2. Create new parallel volume with layout 4 * (2+1) = 12 bricks
I read creating a set of 3 bricks; manually setting it as new replica set and maintaining arbiter logic is not officially supported and easy to break... not a good option

Potential option: Install GlusterFS on ovirt3, add it to the pool?