The Adaptec 2400A can be queried through a utility known as raidutil. Part
of the output of raidutil -L all is:

Physical View
Address Type Manufacturer/Model Capacity Status
---------------------------------------------------------------------------
d0b0t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b1t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b2t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b3t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal

Logical View
Address Type Manufacturer/Model Capacity Status
---------------------------------------------------------------------------
d0b0t0d0 RAID 5 (Redundant ADAPTEC RAID-5 228957MB Optimal
d0b0t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b1t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b2t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal
d0b3t0d0 Disk Drive (DASD) ST380011 A 76319MB Optimal


Address Max Speed Actual Rate / Width
---------------------------------------------------------------------------
d0b0t0d0 50 MHz 100 MB/sec wide
d0b1t0d0 50 MHz 100 MB/sec wide
d0b2t0d0 50 MHz 100 MB/sec wide
d0b3t0d0 10 MHz 100 MB/sec wide

Notice the 10 MHz above. I'm wondering why it is 10, and the others are 50.
Checking around the net, I can't find any examples where these four values
differ from the above.

Examples can be found here:

http://www.google.ca/search?q=%2210+...aptec+2400A%22
http://groups.google.ca/groups?q=%22...ff&sa=N&tab=wg

Opinions?
--
Dan Langille
http://www.bsdcan.org/ - The Technical BSD Conference - Ottawa May 2004