Dell PERC

[Bart Silverstrim]

Somebody, please tell me you're running Ubuntu on a Dell Poweredge 
system with a PERC controller.

I'm running on a RAID 5 container and I believe I'm getting miserable 
disk throughput...

sudo hdparm -Tt /dev/sda

/dev/sda:
  Timing cached reads:   944 MB in  2.00 seconds = 471.24 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate 
ioctl for device
  Timing buffered disk reads:   42 MB in  3.10 seconds =  13.53 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate 
ioctl for device


Hints?  Help?  Guidance?