I have a testlab box (Dell GX620) that was running fine until this
weekend. Although it's testlab box, it's kind of important to me as it
mimics my environment.

I'm trying to determine if it's a hardware issue or software problem.
Any help would be greatly appreciated.

The box doesn't abend. It just dismounts all volumes after a few
minutes of being up. Should I try the pool rebuild?

Again, thank you for your time,