On Fri, Apr 3, 2009 at 4:18 PM, Maros TIMKO <timko at pobox.sk> wrote: > > we are running CentOS 5.2 Xen virtualization system with the latest CentOS > packages with couple of VMs on DELL PowerEdge. "Sometimes" the whole machine > freezes without anything in log files, anything on the console. "Sometimes" > really means we cannot define why or when. Sometimes the machine was idle > with just one VM, sometimes quite busy with couple of VMs. > > Has anybody had the same experience? If yes, any hints on how to resolve it > or how to trace the cause? > The complete freezing of a machine like that sounds like a hardware issue to me, most likely the memory. Does the machine unfreeze after a while or do you have to power cycle the server when it happens ? I would suggest running a memtest. Regards, Tim -- Tim Verhoeven - tim.verhoeven.be at gmail.com - 0479 / 88 11 83 Hoping the problem magically goes away by ignoring it is the "microsoft approach to programming" and should never be allowed. (Linus Torvalds)