Looks like our spontaneously rebooting server might have a hardware issue. Found a complaint in the logs about an interrupt requiring too much time; normally not a concern, but it MIGHT indicate a failing RAID controller -- or one that doesn't handle drive faults gracefully (don't get me started).
@mmeadway A long time ago (remember Netware?) we had a server in our small office that would spontaneously reboot. I personally witnessed this happen: the server machine would begin counting ram as machines did in those days during boot. Eventually we installed power monitoring equipment and discovered the cause to be "occasional neutral to ground spikes." This was traced to both a fault in the building's wiring together with a faulty appliance. Tricky problem.

@JohnTerwiske Oh yes, I have fond memories of Netware. Well, sort of...NLMs were a pain πŸ™‚

Electrical issues are the worst. I asked the data center manager to look for me (he's just as concerned -- if it happened to our server, it could happen to one of the others), so we'll see if there's a loose neutral or something of that nature.

I actually hope it's an electrical issue...not keen on replacing a RAID controller.

@mmeadway As I recall, the Novell engineers brought loaner hardware that we used (they were right up rt. 128 in Wellesley, MA back then) and that led to narrowing it down to fault in building/appliance wiring. This was one of the worst and most time consuming issues I can recall. Software is much easier, thank goodness. Good luck.

@JohnTerwiske You reminded me of an electrical issue we had with a well pump; kept getting low voltage occasionally. Turned out the electrical panel had a loose connection hidden behind a panel. Burn marks everywhere. Tightened the screw, and everything worked fine. Took a month to find.

I'll take all the luck I can get -- thanks!