I would like to deploy HCI with our 2 buildings each with 8 compute nodes.

Each host has a mirrored OS disks and 1 slot for the SSD. So I will use SSD for the glusterfs.

my question is what is the best type of the glusterfs volume? 

I can leave with 8way mirror but what happened if the connection between buildings will go down? 

where will my ovirt-engine start?