In other words, if I bring the machine down to single user, is there a straightforward way that I can upgrade a Reiser3 fs to version 4?
Nope. It's a different system.
You could create a new filesystem, of course, and have it be reiser4, mount it, move everything over, and switch.
For a production machine I'm sticking to reiser3 at the moment. But testing reiser4 is fine.
~ boyd
Boyd Waters National Radio Astronomy Observatory Socorro, New Mexico
