Well its RAID5, 2*70 MB/s ~= 140 doesn't it ? The extra drive just gets used for parity, not parallelism.
Sounds like should be slightly faster according to this :-
Has read for WD 2TB Green between 80-100MB/s so that would mean your RAID setup if your drives are similar should be around 180MB/s. Maybe the Hitachi is slowing it down, what speed is that ?
The Hitachi drive is faster than the WD Green. WD are ~72MB/sec and Hitashi around ~86MB/sec.
This speed isn't THAT slow imho, but the graph look to be cap at 150Mb/sec.. I wonder if it's a problem or not..
I use that array as a video server, so it's not that important, but I like to tweak things
Edited by Vric - 3/21/09 at 2:36pm