Dear users of the SuperMUC petaflop system at LRZ, It has turned out that the electrical infrastructure that powers the system contains defective parts that need to be replaced. Unfortunately, this implies that electrical power must be shut off completely for a few days. Furthermore, LRZ needs to fulfill contractual obligations which involve measuring the energy consumption of specially chosen benchmarks on the complete system. These runs also need a few days of uninterrupted usage of the complete system. Therefore, the system will be unavailable for regular user operation between Sunday November 18, approximately at 12:00 and November 28. If any further delays occur due to unforeseen side effects of the electrical works, we will keep you updated via this document. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4459/ Reinhold Bader