August 2011 - aktuell - lists.lrz.de

Upd:Netzwartung am 16.8.
by LRZ aktuell Aug. 12, 2011

Aug. 12, 2011

Aenderungen an der Mitteilung: Schellingstr. 3: Nur Switches im 4.OG 1. LMU Schellingstrasse 3 Vordergebaeude Stockwerke 3-5 Zwischen 7:30 Uhr und ca. 10:00 Uhr werden die Switches swg1-4gs und swv1-4gs durch leistungsfaehigere Geraete ersetzt. 2. TUM Gruenschwaige Die Firma M-net hat Wartungsarbeiten zwischen 3:00 Uhr und 5:30 Uhr angekuendigt. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4086/ Wolfgang Beyer

1 0

Upd:Linux Cluster: Upgrade of the parallel computing capacity
by LRZ aktuell Aug. 12, 2011

Aug. 12, 2011

Changes to this message: Date corrections LRZ intends to take two new systems into user operation in its Linux Cluster infrastructure within the next weeks; these new systems are focused on efficient execution of large scale parallel programs. The first system is an Infiniband-connected cluster of 16-way shared memory systems with more than 2500 cores delivered by MEGWare, and the second one consists of SGI Ultraviolet (UV) large-scale shared memory systems with more than 2000 cores in total. It is expected that the Infiniband cluster will become available for regular user operation first, followed by the UV system somewhat later. However, the existing UV will be retired from user operation soon because the space it presently occupies will be needed for the new system. Furthermore, the Infiniband cluster will need to be moved into the new LRZ infrastructure later in summer, so there will be a prolonged interruption of operation some weeks after its initial user operation. The altix2 system will be retired from user operation once the new systems are fully available. Users are advised that all new systems, which are targeted to running large parallel jobs, will use SLURM as a batch scheduler. Existing SGE scripts will not work on the new clusters - they will require rewriting of the control section, and will also need modification of the program startup procedure in the script section. Documentation for the new batch system will be available via the Linux Cluster page (http:// www.lrz.de/services/compute/linux-cluster) once user operation starts. The usage instructions for startup of MPI programs will also be updated. We hope that this capacity upgrade will reduce the rather long waiting times which nowadays are observed for parallel jobs. We intend to keep you informed about the status of these new systems via updates to this document. ----------------------------------------------------------------------- Timeline for operational changes Friday, August 12 The Ultraviolet system uv1 will have an interruption of services for 2 hours, starting at 10:00. All running jobs will be removed from the system. The reason for this is that the machine must be physically moved to make room for the UV upgrade. Wednesday, August 17 The Infiniband cluster will be opened for general user operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4065/ Reinhold Bader

1 0

Netzwartung am 16.8.
by LRZ aktuell Aug. 12, 2011

Aug. 12, 2011

1. LMU Schellingstrasse 3 Vordergebaeude Stockwerke 3-5 Zwischen 7:30 Uhr und ca. 10:00 Uhr werden die Switches swg1-1gs, swg1-4gs und swv1-4gs durch leistungsfaehigere Geraete ersetzt. 2. TUM Gruenschwaige Die Firma M-net hat Wartungsarbeiten zwischen 3:00 Uhr und 5:30 Uhr angekuendigt. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4086/ Wolfgang Beyer

1 0

Upd:HLRB-II: CXFS online again
by LRZ aktuell Aug. 11, 2011

Aug. 11, 2011

Changes to this message: CXFS online again On August 9 there was a system crash which also causes the CXFS file systems to fail. Unfortunately the machine has not run stably since then. ----------------------------------------------------------------------- Update Aug 11, 16:15 The CXFS file spaces /ptmp1 and /ptmp2 have gone offline again; therefore further batch processing has been stopped. Update Aug 11, 17:05 The CXFS file spaces are online again. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

1 0

Upd:HLRB-II: CXFS again unavailable
by LRZ aktuell Aug. 11, 2011

Aug. 11, 2011

Changes to this message: CXFS again unavailable On August 9 there was a system crash which also causes the CXFS file systems to fail. Unfortunately the machine has not run stably since then. ----------------------------------------------------------------------- Update Aug 11, 16:15 The CXFS file spaces /ptmp1 and /ptmp2 have gone offline again; therefore further batch processing has been stopped. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

1 0

Upd:HLRB-II: returned to user operation
by LRZ aktuell Aug. 10, 2011

Aug. 10, 2011

Changes to this message: returned to user operation After the system crash from Aug. 9, HLRB-II is now again fully operational. Specificall, the CXFS file systems are accessible again. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

1 0

Upd:Linux Cluster: Upgrade of the parallel computing capacity
by LRZ aktuell Aug. 10, 2011

Aug. 10, 2011

Changes to this message: Status update, incl. UV interruption of operation LRZ intends to take two new systems into user operation in its Linux Cluster infrastructure within the next weeks; these new systems are focused on efficient execution of large scale parallel programs. The first system is an Infiniband-connected cluster of 16-way shared memory systems with more than 2500 cores delivered by MEGWare, and the second one consists of SGI Ultraviolet (UV) large-scale shared memory systems with more than 2000 cores in total. It is expected that the Infiniband cluster will become available for regular user operation first, followed by the UV system somewhat later. However, the existing UV will be retired from user operation soon because the space it presently occupies will be needed for the new system. Furthermore, the Infiniband cluster will need to be moved into the new LRZ infrastructure later in summer, so there will be a prolonged interruption of operation some weeks after its initial user operation. The altix2 system will be retired from user operation once the new systems are fully available. Users are advised that all new systems, which are targeted to running large parallel jobs, will use SLURM as a batch scheduler. Existing SGE scripts will not work on the new clusters - they will require rewriting of the control section, and will also need modification of the program startup procedure in the script section. Documentation for the new batch system will be available via the Linux Cluster page (http:// www.lrz.de/services/compute/linux-cluster) once user operation starts. The usage instructions for startup of MPI programs will also be updated. We hope that this capacity upgrade will reduce the rather long waiting times which nowadays are observed for parallel jobs. We intend to keep you informed about the status of these new systems via updates to this document. ----------------------------------------------------------------------- Timeline for operational changes Friday, August 12 The Ultraviolet system uv1 will have an interruption of services for 2 hours, starting on 10:00. All running jobs will be removed from the system. The reason for this is that the machine must be physically moved to make room for the UV upgrade. Tuesday, August 16 The Infiniband cluster will be opened for general user operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4065/ Reinhold Bader

1 0

Linux-Cluster: ICE unavailable for one week
by LRZ aktuell Aug. 10, 2011

Aug. 10, 2011

The SGI ICE system will be unavailable for regular user operation between 22nd and 30th of August, 2011. This is due to an operating system and batch queueing upgrade. After this extended maintenance, the system will be run in a SLURM cell of the Linux Cluster; please consult the cluster documentation at http://www.lrz.de/services/compute/ linux-cluster/ for upcoming details on this new batch software deployed on the parallel segments of the LRZ cluster. Submission of SGE jobs to the ICE will not work anymore after the upgrade. After the upgrade, it is recommended that you perform the following measures: * recompile and relink your programs using the new sgi MPT release * modify your batch scripts to use SLURM instead of SGE This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4083/ Reinhold Bader

1 0

Upd:HLRB-II: still partially unavailable
by LRZ aktuell Aug. 10, 2011

Aug. 10, 2011

Changes to this message: still partially unavailable After the system crash from Aug. 9, HLRB-II is presently still partially unavailable. In particular, starting interactive jobs is suspended, and the CXFS file systems are not accessible on the login partition. Apologies for the disruption of your work. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

1 0

HLRB-II: temporarily unavailable for user operation
by LRZ aktuell Aug. 9, 2011

Aug. 9, 2011

Due to a system crash, HLRB-II is presently (Tuesday, Aug. 9) unavailable for user operation. We expect the system to go online again around 12:00 today. Apologies for any disruption of your work. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

1 0