Hi everybody, thanks for your immediate response. I will replace the board, but I am wondering what the error message actually means? > Oct 16 14:07:36 xenserver1 kernel: EDAC MC0: UE row 0, channel-a= 0 > channel-b= 1 labels "-": NON-FATAL recoverable (Branch=0 DRAM-Bank=0 > Buffer ID = 0 RDWR=Read RAS=0 CAS=0 NON-FATAL recoverable Err=0x2000 > (FB-DIMM Configuration Write error on first attempt)) I understand that the system logs an error if the configuration data is written into the RAM-configuration. The error happens precisely once a second. Why the * would the kernel reprogram the RAM configuration once every second? best regards Michael Schumacher mailto:michael.schumacher at pamas.de