Dear users of the new SuperMUC Petaflop system at LRZ, the system is nearing the end of its acceptance testing. In order to successfully conclude the acceptance procedure, an interruption of operation for internal testing purposes is scheduled for Monday, September 10, 12:45, to Tuesday, September 11, 18:00. At the beginning of this period, all batch jobs will be removed from the system. During the interruption, no access to the system and no batch processing will be possible. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4402/ Reinhold Bader