On Nov 13, 2007 8:03 AM, Ken Price <kprice at nowyouknow.net> wrote: > I've used both the Promise UltraTrak SX8000 (8-disk RAID50) and > UltraTrak SX4000 > (4-disk Raid10). Performance was adequate, but I was using Dell > PERC2/3 RAID cards. In testing, a plain-jane Adaptec SCSI card > coupled with software RAID gave "significantly" better results. This is beginning to wander a bit off CentOS, but why would you need a PERC card *and* a Promise UltraTrak? The UltraTrak *is* a hardware RAID.