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Upd:Linux Cluster: Upgrade of the parallel computing capacity
by LRZ aktuell Aug. 18, 2011

Aug. 18, 2011

Changes to this message: Online now 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 has 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. Thursday, August 18 The Infiniband cluster is opened for general user operation. Update: We're online since August 18, 12:00. Good luck for your simulation endeavours. Monday, September 12 The Altix 4700 is retired from user operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4065/ Reinhold Bader

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Upd:HLRB-II: CXFS online again
by LRZ aktuell Aug. 18, 2011

Aug. 18, 2011

Changes to this message: intermittent I/O problems 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. Update Aug 18: We have reports on intermittent failures of I/O in some jobs. The cause of this is being investigated; it may be related to the very high I/O load presently observed on the system. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4082/ Reinhold Bader

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Upd:Linux Cluster: Upgrade of the parallel computing capacity
by LRZ aktuell Aug. 17, 2011

Aug. 17, 2011

Changes to this message: MPP cluster user operation delayed 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 has 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. Thursday, August 18 The Infiniband cluster is opened for general user operation. Update: General user operation is delayed from the original target date, probably until Thursday, because an unforeseen problem with the batch system has surfaced when switching on accounting. Monday, September 12 The Altix 4700 is retired from user operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4065/ Reinhold Bader

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Upd:Linux Cluster: Upgrade of the parallel computing capacity
by LRZ aktuell Aug. 16, 2011

Aug. 16, 2011

Changes to this message: Altix2 retirement date 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 has 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 is opened for general user operation. Monday, September 12 The Altix 4700 is retired from user operation. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4065/ Reinhold Bader

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Stromabschaltung LMU 27.-29.8.
by LRZ aktuell Aug. 12, 2011

Aug. 12, 2011

Hier ist eine Ankuendigung der LMU-Verwaltung bezueglich einer Stromabschaltung in einigen Gebaeuden der LMU. Sehr geehrte Damen und Herren, auf Grund starker Verschmutzung unserer neuen NSHV Ludwigstr. 28VG, welche durch Arbeiten des Bauamts verursacht wurde, muss diese jetzt gereinigt werden. Hierfuer muss alles abgeschalten werden, folgende Haeuser sind betroffen: - Ludwigstr. 28 VG, - Ludwigstr. 28 RG, - Ludwigstr. 28 TG, - Vestibuelbau, - Professor-Huber-Platz 2 - Veterinaerstr. 1, - Kaulbachstr. 45, - Kaulbachstr. 51a. Der Termin fuer die Abschaltung ist Samstag 27.08 bis Montag 29.08.11 06:00 Uhr. Ich bitte hiermit die Hausverwaltung die aufgezaehlten Gebaeude zusperren. Die Tiefgarage muss auch gesperrt werden, da die Sprinkleranlage abgeschalten wird. Fahrzeuge koennen darin stehen bleiben, Ein- und Ausfahrt ist nicht moeglich. Die Cafeteria wird von uns provisorisch versorgt, wir benoetigen zur Sicherheit wieder den Schluessel. Die BMZ in der Ludwigstr. 28VG wird provisorisch versorgt. Des weiteren koennen wir der EDV im EG Ludwigstr. 28VG, EDV Ludwigstr. 28RG (Herr Thoennissen) und LRZ-Knotenpunkt provisorisch versorgen. Fuer Fragen stehe ich gern zur Verfuegung. Mit freundlichen Gruessen Minsel Ludwig-Maximilians-Universitaet Muenchen Referat V.1 / Leitung Zentralwerkstatt Allgemeine Betriebstechnik Geschwister-Scholl-Platz 1 80539 Muenchen Tel: 089 / 2180 5092 Fax: 089 / 2180 99 5092 E-Mail: peter.minsel(a)verwaltung.uni-muenchen.de Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4087/ Wolfgang Beyer

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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

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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

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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

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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

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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

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