Hi barry07
I had a quick look at the machine specs at
http://h18000.www1.hp.com/products/q.../11485_na.html
On the surface of it, my main concern would be the chipset used for the SCSI controller.
Albeit of different design, I have a number of HP Netservers, which I was only able to run "out of the box" Linux installs from the red Hat 8.0 and 9 era for vanilla Linux releases.
I was unable to install Centos and a number of other later releases (this is going back quite a while), because there was a redesign of the SCSI subsystem where in the older HP Netraid SCSI controllers were obsoleted (ie. dropped from the new driver design).
All in all. It would be a case of install and see with a modern Linux distro.
On the other hand given the cost of EIDE and SATA hard disk drives, you could ditch any SCSI drives (including the optical drive if it is SCSI) and use EIDE or SATA with an inline SATA to EIDE converter (cheap and transparent).
I can see the attraction to using such a machine, if it is one of the higher capability units. However, age, power consumption, and cost of re-fitting may make it a less desirable option that using a more modern hardware platform.
I haven't looked at the HP Linux releases for this era because I found that my HP Netservers worked quite happily with RH 8.0 and 9 (including the SCSI RAID controllers), and I had no need for the remote access/admin hardware features (which I ditched to save power).
Best of luck.
Would be interested, if you proceed, to read what you make of these systems and Linux
C.
PS. Have a really good dig at the HP website, its a really useful resource for researching their old'er hardware.