One of our customers with a site similar uses a quad Xeon Dell system with 2
GB of memory and all disk on their SAN.  His db is in the 60GB range.

I would think that an optimal local disk configuration would be JBOD or
perhaps two RAID sets one with the DB/Log and the other for storage pools.
Use a RAID controller with plenty of cache to help out with performance.  I
would even consider JBOD for the storage pool volumes.  You could even do
JBOD and use TSM mirroring for the db and log (this is the best performing
option) and no RAID.

Since PCI SCSI adapters are cheap and 9840s are very fast I would probably
opt for one drive per channel using Adaptec 39160 controllers.  In general
we configure two drives per channel but we're usually using slower drives so
this works fine.  As soon as we think we have a bottleneck there we'll add
controllers.

Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs, CO 80949
lipp AT storsol DOT com or kelly.lipp AT storserver DOT com
www.storsol.com or www.storserver.com
(719)531-5926
Fax: (240)539-7175