I just built a new server with a fresh install of 6.0.1, then pulled a desktop backup from the old server and loaded it into the new server. There were lots of little things to straighten out, but mostly it went swimmingly.
Here's the odd thing, though: my old server had an extra hard drive for music. Once I had the new server working, I shut it and the old server down, then moved the extra hard drive from the old server to the new.
Started up the new server, all is well.
Started up the old server (needed the fstab entry for the extra disk) and it won't boot! It gets as far as saying that it is starting, then throws a block error...or sits for several minutes and throws a different error (can't remember which). Either way, it never gets to the kernel.
So what happened, and how? I'd love to hear theories...
I consider myself very lucky that the new server is working fine, because I can't throw the old server back up if there's a problem (which was the original idea).