GNU/Linux is known to run on the following systems:
SBUS based servers
Enterprise 1
Enterprise 2
Enterprise 150
Enterprise 3000
Enterprise 3500
Enterprise 4000
Enterprise 4500
Enterprise 5000
Enterprise 6000
Enterprise 6500
Enterprise 10000 (up to 64 CPUs can be fitted in this server.
It is nicknamed StarFire).
More information about running a 2.6.x GNU/Linux kernel on an E10k can be found
on this page:
http://people.debian.org/~fabbione/e10k/debian_on_e10k.txt
As far as I know, Linux on these systems have been tested with up to 24 CPUs
PCI based servers
Enterprise 250
Enterprise 450
One of the locations installation kernel images can be downloaded from
is