Dear users of the SuperMUC petaflop system at LRZ, due to a combined hard- and software maintenance both the thin and fat nodes of the system will be unavailable for user operation starting in the early morning of October 28. It may be necessary to stop batch scheduling already on the preceding Sunday afternoon. We expect the system to be available for user operation again in the afternoon of October 31. The following changes are noteworthy: * both LoadLeveler and IBM PE will be upgraded to more recent bug-fix releases. These changes should be transparent to users, i.e. no recompilation of software should be needed. * due to a recenty identified bug, there is a minor change in the way energy tags must be configured if you wish to run your job at a non-default frequency. The documentation at http://www.lrz.de/ services/compute/supermuc/loadleveler/#energy has been accordingly updated. * When you renew your password using the ID portal (https:// idportal.lrz.de), you now have to confirm that your work and the results are compliant with the EU and German export and embargo regulations. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4681/ Reinhold Bader