Hi Jens,

Thanks for the reply. In the System event log, I see several of these messages that occur during boot:

ID = 6eb : 04/22/2012 : 00:27:29 : Memory : BIOS : Configuration Error
Is it possible that there is a strange setting in BIOS that would not play well with mcelog? The machine in question is a Sun Fire x4140.

Either way, we plan on taking the server down one evening and running memtest86 overnight.