Hi there, I'am running CentOS 5.1 on a Dual AMD Opteron QuadCore System, without major issues so far. But if I call mcelog I'am getting the message "Cannot open /dev/mcelog" ... because it's not there. I'am running 2.6.18-53.1.4.el5xen kernel, is this related in any form? I found something similar for the debian universe: http://www.mail-archive.com/debian-bugs-closed@lists.debian.org/msg11168 4.html Best Regards --Michael