Which OS for a Sun Ultra 10

[LoadWB]

I am not well-versed in SPARC hardware, but I believe Solaris 9 should support your Ultra 10, including the network interface.  I have Solaris 9 running on a SparcStation 10 and a SparcStation 20, which I believe are more legacy than your Ultra 10.  I also cheated and added a SCSI/HME (100Mb/s) S-Bus card to each, so I rarely, if ever, used the on-board Ethernet.

As for the PCI USB, it should be an easy trip to the HCL on Oracle's site.  I only worked with one PCI-based SPARC system in my time, and it used some 3Com-looking card.  Sadly, I was not involved in its set up.

Good luck.

[LoadWB]

Oracle are being nasty regarding "Solaris".

And MySQL, and Java...

[LoadWB]

Actually I was lying about the Ethernet not working. Apparently I have the same SCSI/Ethernet card which LoadWB mentioned. I wasn't aware of the mobo Ethernet port at the bottom of the case =). I plugged the cable into that and hey presto, network connection. But indeed Solaris isn't resolving anything automatically so I guess I'll have to config the DNS settings myself.

Check your /etc/resolv.conf.  There is a manpage for it.

Are there any major differences between Solaris 9 and 10?

ZFS and Zones (virtualization, baby!)  (EDIT: Amongst a few other things.) I particularly like Solaris Zones.