I am running 2x Cheetah 15k.3 (Firmware #0005) in RAID0 on Adaptec 29320-R. Both my HDDs were all normal (i.e. 60-70MB/s STR, less than 6ms Random Access, 110-120MB/s Burst Read Speed) before I enable HostRAID to RAID0 them together. After I RAID0 them together and installed Windows XP SP2, the transfer rate of the RAID became capped at 40MB/s ( about 35MB/s STR, 35MB/s Burst Read, etc).
So for some reason my bus is somehow downgraded to UW SCSI.
I checked channel B of the adapter (where my HDDs located at), all drives are detected as up to 320MB/s transfer rate.
I checked channel A of the adapter (with no HDD connected), all "drives" are detected as up to 40MB/s. I think this is normal since channel A is used to support legacy SCSI.
Both channel A & B are hostRAID enabled. (I tried to enable only B, and yields the same results.
So if anyone could offer some insight on my mistakes, I would greatly appreciate it.