All of my virtual disks are hosted off my FreeNAS, I've got a direct 10GbE link between it and my oVirt host - raw throughput isn't so much the issue most of the time as IOPS are, I've got a local gitlab instance, OpenShift, some PostgreSQL databases, etc. and they like to hammer the crap out of my storage when in use.
Having an L2ARC helps out quite a bit, but only having 32GB of memory and wanting to keep most of it for the L1ARC means I still hit my spinning disks regularly (and mirrored vdev's help read IOPS tremendously in this case).
Having an L2ARC helps out quite a bit, but only having 32GB of memory and wanting to keep most of it for the L1ARC means I still hit my spinning disks regularly (and mirrored vdev's help read IOPS tremendously in this case).