You do not need to define the gluster IPS or hostnames during the initial deployment.  You deploy first then you setup the gluster network after.  Serafh for the up and running with Ovirt 4.2 glusterfs guide, it's slightly dated but goes over how to setup the separate gluster network.

On Tue, Sep 11, 2018, 11:51 AM florentl, <florentl.info@laposte.net> wrote:
Hello,
I want to deploy ovirt (hosted engine) and gluster on three servers. I
have thought about a configuration but I'm not sure that it's the most
suitable one.
All the servers have 2 ten gigabit Ethernet nic.
I read that, am besten,  I must dedicate one nic for the storage and
another one for the system.
So I will have two netnork address space :
- for the system : 192.168.176.0/24 with a gateway configured
- for the storage : 10.255.255.0/24 without a gateway

Inside my hosts file on all the server I will have :
192.168.176.1 server1
192.168.176.2 server2
192.168.176.3 server3
10.255.255.1 gluster1
10.255.255.2 gluster2
10.255.255.3 gluster2

When I start the gluster deployment I will use gluster1, gluster2 and
gluster3 name. And after the gluster deployment during  the
hyperconverged setup I will use server1, server2 and server3 name.

May I have your opinion about this deployment  ?
Thanks in advance for the help.

Florent LORNE
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