Gluster is quite smart, but in order to provide any hints , can you provide output of 'gluster volume info <glustervol>'.
If you have 2 more systems , keep in mind that it is best to mirror the storage on the second replica (2 disks on 1 machine -> 2 disks on the new machine), while for the arbiter this is not neccessary.

What is your network and NICs ? Based on my experience , I can recommend at least 10 gbit/s interfase(s).

On May 26, 2019 07:52, Leo David <leoalex@gmail.com> wrote:

Hello Everyone,
Can someone help me to clarify this ?
I have a single-node 4.2.8 installation ( only two gluster storage domains - distributed single drive volumes ). Now I just got two identintical servers and I would like to go for a 3 nodes bundle.
Is it possible ( after joining the new nodes to the cluster ) to expand the existing volumes across the new nodes and change them to replica 3 arbitrated ?
If so, could you share with me what would it be the procedure ?
Thank you very much !

Leo