Changes to this message: Partially returned to user operation Update (Feb 1 17:15): Except for the MPP segment, the cluster systems have been returned to user operation. Possible configuration problems on the MPP cluster still need investigation, please bear with us. ----------------------------------------------------------------------- Maintenance windows Due to an extended hard- and software maintenance, the MPP, MAC and 8-way Myrinet clusters will be unavailable for user operation between Jan 28, 8:00 am and Feb 1. This includes the login nodes lxlogin1-2. ( Note: Until Jan 31, 8:00am, the lxlogin3.lrz.de system will remain available for submission of serial jobs.) All other cluster segments (serial cluster including all hosted systems, sgi ICE and UV systems, 32 way Myrinet systems) will be unavailable between Jan 31, 8:00 am and Feb 1. Configuration changes * The default MPI environment on the MPP cluster will be changed from Parastation MPI to Intel MPI. However, the mpi.parastation module will remain available for legacy use until the end of 2013. On the sgi ICE and UV systems, the sgi MPI (mpi.mpt) will remain default. * The 8-way Myrinet Cluster will be retired from parallel processing, and the nodes will be added to the serial processing pool. This implies that the partition "myri_std" in the SLURM cell "myri" will become unavailable. * For the serial queues, SLURM fair share scheduling will be introduced. For the parallel queues, a combination of fair share scheduling and favoring large jobs will be activated. This is to prevent a single user from monopolizing cluster segments for long times if there are many jobs in the queue. * New storage systems will be introduced for the WORK (==PROJECT) and SCRATCH file systems. Please note that LRZ will only migrate WORK data to the new file system; data in SCRATCH will not be migrated. However the old SCRATCH file system will remain available as a separate mount in read-only mode on the login nodes until the end of March, 2013. Migration of data can then be done via commands like cd $SCRATCH_LEGACY cp -a my_scratch_subdirectory $SCRATCH The environment variable $SCRATCH_LEGACY will remain defined and point to the legacy scratch area until end of March, 2013. Further configuration changes may occur and will be added to the above list if they are applied. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4501/ Reinhold Bader