How's my RAID 6 performance?

[michelkenny]

So a while ago I bought an Areca 1680i and an HP SAS Expander card. The 1680i is running firmware 1.48 and the SAS Expander 2.0.2. I have one RAID 6 array consisting of 8 x Western Digital Caviar Black 1 TB drives (WD1001FALS) and another RAID 6 array consisting of 6 x Hitachi 2 TB drives (HDS722020ALA330).

I've always been curious whether the speed I am getting is up to par with what it should be or if there is a problem somewhere. HD Tune and Crystal DiskMark benchmarks are linked below. Any comments would be greatly appreciated! If there is another benchmark tool that I should use, please let me know.

HD Tune:

Hitachi RAID 6:

Western Digital RAID 6:

Crystal DiskMark:

Hitachi RAID 6:

Western Digital RAID 6: