[ovirt-users] Beginning oVirt / Hyperconverged

Hey folks! Quick question, really: I have 4 servers of identical hardware. The documentation says "you need 3", not "you need 3 or more"; is it possible to run hyperconverged with 4 servers (in same rack, let's neglect the possibility of 2 failing servers (split brain))? Also: I have a nice seperate server (low power footprint, big on cpu (8) and has 32gb ram)-- would love to use this as engine server only. Can I initiate a hyperconverged system with 4 working host starting from a stand-alone engine? Or does "hyperconverged" a must for HA engine on the cluster? One last one: Installing ovirt nodes, obviously. This will by default create a lvm across the entire RAID volume; can I simply create folders (with correct permissions) and use those as gluster bricks? Or do I need to partition the RAID in a special way? Thanks for your pointers, Chris.