No problem, I've been very busy myself during these last few years. I've been working with Houdini all that time, only not very intensively (not as much as I'd like to). It's nice to see this forum still alive and well, and familiar people like yourself.
The reason I asked you about IRIX is because not all too long ago I got my hands on a Tezro, and I definitely don't want to 'move on' and away from it yet! With a FC HDD-array and all, it's really nice. The kind of quality you will rarely find nowadays, even if the CPU speed isn't on par with the nowadays' faster/fastest x86 systems (the throughput is amazing). I'd say, the reason why Linux is so good and so successful is probably because it can look a lot like IRIX. But then, Linux only if you have a system that is hand-picked to work with the configuration (and drivers available for it). By the way, what kind of SGI system do/did you have?
It's such a shame SGI gave up on its MIPS-powered IRIX line. Well till in 2007, studios have been using SGIs. It has only decreased since then, except for some fields (medical/scientific research [for MRI scanning, even O2s are still doing that nicely I heard recently], some post-production studios still have SGI-powered IFFFS suites to name a few things).