[squid-users] Multiple Cache dir - newbie question

Hi

I have to set up a couple Squid proxy for our Uni on 2 HP ML530 servers. =
I am planning to run it on Red Hat 8.0 . The server has got eight SCSI =
hard disk. I think it has got only one controller. I am thinking of =
mirroring ( hardware mirror) the first two which will be used by the OS. =
The rest ( 6 disks) won't be RAID ed and mounted as

cache1
cache2
etc......
cache6

Is the above the best configuration for this server to have best =
performance? Will multiple cache dir increase the performance? Each disk =
is 36 GB, so is it a good idea to increase the "Level-1" and "Level-2" =
numbers?

cache_dir ufs /cache1 30000 64 1024 =20

Thanks in advance for the help.
Mathew