Update: I've done more iometer testing with RAID 10 arrays (using 6 intel x-25M SSDs) using 512k, 256k and 128k stripe sizes. The best results I got were at 128K stripe size.

In IOMeter, I got +200 MB/s transfer speeds for 16k and 32k both random and sequential. I used 8 workers and 64 oustanding ops.

I pretty much always got terrible results the lower I go, is that normal? Like 6MB/s writing (both random and sequential) at 512b.

Everything with the VMs seems pretty fast now, I can copy a large file from one folder to another at about 35MB/s, but any time I try to clone a VM it is incredibly slow, like 1MB/s. I haven't had the patience to let it complete yet. Anyone have any suggestions?