On Thu, 4 Oct 2007, Andrew Clayton wrote:

On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote:

quoted

What type (make/model) of the drives?

The drives are 250GB  Hitachi Deskstar 7K250 series ATA-6 UDMA/100

quoted

True, the controller may not be able to do it either.

What types of disks/controllers again?

The RAID disks are currently connected to a Silicon Image PCI card are
configured as a software RAID 5

03:04.0 RAID bus controller: Silicon Image, Inc. SiI 3124 PCI-X Serial ATA Controller (rev 02)
       Subsystem: Silicon Image, Inc. Unknown device 7124
       Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 16
       Memory at feafec00 (64-bit, non-prefetchable) [size=128]
       Memory at feaf0000 (64-bit, non-prefetchable) [size=32K]
       I/O ports at bc00 [size=16]
       Expansion ROM at fea00000 [disabled] [size=512K]
       Capabilities: [64] Power Management version 2
       Capabilities: [40] PCI-X non-bridge device
       Capabilities: [54] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-


The problem originated  when the disks where connected to the on board
Silicon Image 3114 controller.

quoted

Justin.

Andrew
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7K250

http://www.itreviews.co.uk/hardware/h912.htm

http://techreport.com/articles.x/8362
"The T7K250 also supports Native Command Queuing (NCQ)."

You need to enable AHCI in order to reap the benefits though.

Justin.