[ovirt-users] GlusterFS performance with only one drive per host?

[Jayme]

I'm spec'ing a new oVirt build using three Dell R720's w/ 256GB.  I'm
considering storage options.  I don't have a requirement for high amounts
of storage, I have a little over 1TB to store but want some overhead so I'm
thinking 2TB of usable space would be sufficient.

I've been doing some research on Micron 1100 2TB ssd's and they seem to
offer a lot of value for the money.  I'm considering using smaller cheaper
SSDs for boot drives and using one 2TB micron SSD in each host for a
glusterFS replica 3 setup (on the fence about using an arbiter, I like the
extra redundancy replicate 3 will give me).

My question is, would I see a performance hit using only one drive in each
host with glusterFS or should I try to add more physical disks.  Such as 6
1TB drives instead of 3 2TB drives?

Also one other question.  I've read that gluster can only be done in groups
of three.  Meaning you need 3, 6, or 9 hosts.  Is this true?  If I had an
operational replicate 3 glusterFS setup and wanted to add more capacity I
would have to add 3 more hosts, or is it possible for me to add a 4th host
in to the mix for extra processing power down the road?

Thanks!
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