Tru64 featured AdvFS, which was awesome for the time (pre-ZFS).

https://en.wikipedia.org/wiki/AdvFS

seems this is the article you really wanted to link to...

https://astr0baby.wordpress.com/2017/02/20/unix-os-archaeolo...

Surprisingly Tru64 only reached end-of-life in December of 2012, with the last release happening in 2010. Depressingly, some of the modern software I write at work is required to be compatible with Tru64 5.0 as some of our customers are still running that OS.

The article that's linked to is about a Soviet Unix clone. It's pretty cool, too.

The MicroVAX II was alleged to have this etched into some revs, in Cyrillic: "MicroVAX: when you care enough to steal the very best"

This link isn't for a post on Tru64 but rather:

"Unix OS archaeology – Soviet UNIX clone DEMOS pt.2"

Also interesting but perhaps correct the URL in the title?