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February 2013

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Upd:SuperMUC: scheduled maintenance Jan 28 31
by LRZ aktuell Feb. 1, 2013

Feb. 1, 2013

Changes to this message: Extended maintenance continues Update 3 (Feb 1 14:50): IBM is still investigating the cause of the problems observed in internal testing. It appears that there exists an incompatibility between one or more updated system software components. Therefore, no user operation can be expected for the weekend. We will update you on the status on Monday, Feb 4. ----------------------------------------------------------------------- Update (Jan 30 afternoon): In order to check additional hardware and firmware modifications that were done to improve the stability of the system (see also http://www.lrz.de/services/compute/supermuc/aktuell/ ali4512/, as well as dedicated operation for a project that requires short-term use of the complete machine, user operation of the system is delayed to the afternoon of January 31. ----------------------------------------------------------------------- Dear users of the SuperMUC petascale system at LRZ, Due to a combined hard- and software maintenance, SuperMUC will be unavailable for user operation between January 28, 8:00 and the afternoon of January 31. Jobs still running at the beginning of the maintenance will be cancelled. The following changes are introduced by this maintenance: * Access to the PRACE network will become available to PRACE users, * LoadLeveler mail notification will be activated, * Licence servers will be accessible from the compute nodes, * The Infiniband software stack will be updated to a newer release, * Some presently missing packages will become available on the compute nodes (e.g., you can remove the workaround for a missing libnuma.so) This information is also available on our web server http://www.lrz-muenchen.de/services/compute/supermuc/aktuell/ali4502/ Reinhold Bader

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Upd:Linux Cluster: Maintenance and Configuration Changes Jan 28 - Feb 1
by LRZ aktuell Feb. 1, 2013

Feb. 1, 2013

Changes to this message: Updated changes 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

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