Hi Anton,
There is nothing special for upgrading HCI env with Gluster. Bellow steps will be enough:
1- Stop glusterd service in one node which needs to be upgraded.
2- upgrade that node and start glusterd service.
3- wait heal to be completed.
4- continue same procedure for other nodes.
In your case can you please restar glusterd in all nodes and check. If it's still not working please share glusterd log?
Also please share "gluster volume status" out put.
From: Sandro Bonazzola <sbonazzo@redhat.com>
Sent: Tuesday, October 1, 2019, 5:01 PM
To: Anton Marchukov; Gobinda Das; Sundaramoorthi, Satheesaran; Sahina Bose
Cc: users; Akshita Jain
Subject: Re: [ovirt-users] Fwd: Unable to Upgrade