OVirt + Gluster is called 'Hyperconverged' setup and it supports only replica3 
or a 'replica3 arbiter1' volumes.
 Vmware VSAN is another popular Hyperconverged Setup but requires a lot of 
licenses.
The CPU and Disk  resources are plenty on virtualization Hosts and this setup 
allows you to save space by removal of the iSCSI/NFS/SAN dedicated system.

The setup is quite popular and it works quite well, but requires a 10G network 
(as load balancing smaller NICs is very hard ) - if performance is required, 
while even a 1 gbit/s NIC is possible to be used.
Note: 1gbit/s will provide no more than 87 MB/s on gluster level for all your 
VMs , which is very poor.

If you have 4 hosts -> one of them will not be in the gluster setup, or you 
will have 2 separate gluster volumes like this:
oVirt1- Replica for volume A
oVirt2- Replica for volume A , arbiter for volume B
oVirt3 - Replica for volume B,arbiter for volume A
oVirt4 - Replica for volume B

Then you add them as hosts in your oVirt setup.

Best Regards,
Strahil NikolovOn Jun 10, 2019 05:29, [email protected] wrote:
>
> Hi, everybody. When I was looking at the administrator's manual, it prompted 
> Clusters run virtual machines or Red Hat Gluster Storage Servers. These two 
> purposes are mad exclusive: 
> Virtualization and storage hosts together. When I configured the cluster, I 
> said that the glusterfs and virt I saw were alternatives to the two 
> checkboxes. 
> I would like to ask what happens when glusterfs and virt are in the same 
> cluster? 
> How can I use hosted engine when I have four nodes? 
> Thank you very much for your reply.
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