Tonight, around 7:30 our router and most of our servers crashed. The router rebooted, only one of the Intel servers came back up, the Sparc servers all survived the event.
I suspect a power hit, but I tried to call the people at Isomedia tech support and only got voice mail with a full mailbox so I was not able to find out what happened tonight.
I rebooted and brought all the servers back online. I did discover some configuration errors with nsswitch.conf on one server and fstab on another that prevented them from fully coming back on their own and corrected those.