Dear ML We upgraded a Dell Poweredge PE 1950 Server the 8th of May. Since then the server rebooted 3 times without external cause (it is located in a server farm with redundant power supply etc.). Looking at the servers monitoring infrastructure with Dell's own OpenManage tools, I get strange errors: [root at servernew ~]# omreport system esmlog (....) Severity : Critical Date and Time : Mon May 11 17:46:59 2009 Description : System Software event: run-time critical stop was asserted Severity : Critical Date and Time : Fri May 15 21:07:57 2009 Description : System Software event: run-time critical stop was asserted Severity : Critical Date and Time : Wed May 20 21:00:53 2009 Description : System Software event: run-time critical stop was asserted (...) This class of errors never happened before in over a year that the server is running. There is no mention of any anomaly, except the boot messages itself, in /var/log/messages. The server runs the 64 bit flavor of CentOS hosting some XEN virtual machines and some PostgreSQL and MySQL databases. It run without any issues with CentOS 5.1 and 5.2. I interpreted these issues as some kernel/software related problem, but do not know how to make a more accurate diagnosis of the problem. Can anybody give me some hint? Has anybody had some similar issue? Regards, Peter -- Dott. Peter Hopfgartner R3 GIS Srl - GmbH Via Johann Kravogl-Str. 2 I-39012 Meran/Merano (BZ) Email: peter.hopfgartner at r3-gis.com Tel. : +39 0473 494949 Fax : +39 0473 069902 www : http://www.r3-gis.com