I am currently in the process of researching converting an existing SMB infra to virtual. Ovirt/RHEV is a strong contender and checks off a lot of boxes on our list. GlusterFS is appealing but I am finding it very difficult to find any answers or stats/numbers regarding how well it can perform as backend storage for VMs, especially VMs with medium to high workloads, and possibly some or many in a dev environment where many small files are interacted with very frequently.
From my research on GlusterFS in general some people tend to say that it is not the best performer and it's not the best choice for handling small files. How true is this?
I understand that there are many variables such as hardware, drives, proper configuration, internal network etc. but what I'm trying to avoid here is going through the whole process of spendng a lot of money building out an ovirt gluster with a proper SSD glusterFS configuration w/ 10gbe internal network only to find out some day down the road that it cannot meet our I/O needs.
Can anyone comment on how I can best determine the performance level to expect from a typical ovrt w/ glusterfs replica 3 arbiter 1 configuration. Or perhaps any use cases with people/companies running a similar setup in production with high VM workloads?