3rd party hard disk for 320H?

[X03 at psuvm.psu.edu]

We are planning to purchase a 6000/320H and want to attach an external scsi
hard disk to it.  We want to put AIX on it and use internal hard disk for user
files and applications.  I would like to have advice/suggestions from those of
you have such experience.  Will it be difficult to boot from external disk?
How much trouble to attach such a device to 320H, any special device drivers?
Prices/performance?

How about memory?

Thanks.

Xiaowu Chen
Penn State