I have a Dell PE2590 with a PERC5 handling a 6 disk RAID5 array. Write-back caching is enabled but it's defaulting to write-through. This is obviously murdering performance (writes = 30Mbps vs 300Mbps ...

I currently am working with someones Dell server that has 3x2TB SATA drives (7200rpm) in a RAID5 array (PERC5) running Windows 7. I did a quick CrystalDiskMark and the read speed was fine (~300MB/s) ...