IOMeter is another open source synthetic benchmarking tool which is able to simulate the various loads placed on hard drive and solid state drive technology.
We set IOmeter up (as shown above) to test both backup and restore performance on a 100GB partition.
Once again the AS6204T shows pretty good consistency, getting close to 100MB/s across all the arrays in both reads and writes with the notable exception of when in RAID 6. In RAID 6 there is a pronounced drop in write performance and while there is a dip in the read performance, it's nowhere near as much as in writing mode.