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Linux Cluster: New IB cluster offline
by LRZ aktuell Aug. 25, 2011

Aug. 25, 2011

Dear users of the new IB cluster at LRZ, probably due to the failure of a critical component the complete cluster has gone offline on the evening of Aug. 25. We will investigate the cause for this crash on Friday morning and attempt to return to user operation as soon as possible. We will keep you updated about the status of the cluster via this document. Apologies for the disruption of your work. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/aktuell/ali4092/ Reinhold Bader

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Upd:Update: HLRB-II login node back in production
by LRZ aktuell Aug. 25, 2011

Aug. 25, 2011

Changes to this message: Update Dear users of HLRB-II, the problems on the login node of HLRB-II have been fixed and it is back in production. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4091/ Hans-Georg Kleinhenz

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HLRB-II login node down
by LRZ aktuell Aug. 25, 2011

Aug. 25, 2011

Dear users of HLRB-II, the login node of HLRB-II is currently down. SGI is already working on the problem. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4091/ Hans-Georg Kleinhenz

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UNIX-Systemverwalterkurs (Linux): Noch Plaetze frei
by LRZ aktuell Aug. 24, 2011

Aug. 24, 2011

Beim UNIX-Systemverwalterkurs des Leibniz-Rechenzentrums sind noch Plaetze frei. Datum: * Theorie: 12. - 16.9.2011, jeweils nachmittags * Praktikum: 26. - 30.9.2011, jeweils ganztaegig Weiterfuehrende Informationen (www.lrz.de/services/schulung/admks/) * Inhaltliche und organisatorische Details * Allgemeines zu Kursen * Kursuebersicht und Anmeldung * Bei Fragen schicken Sie bitte eine E-Mail an die Adresse < admks-info(a)lrz.de>. Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/schulung/aktuell/ali4090/ Ernst Boetsch

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Netzbetrieb: Netzwartung am 23.08.2011
by LRZ aktuell Aug. 22, 2011

Aug. 22, 2011

Am 23.08.2011 werden folgende Wartungsarbeiten durchgefuehrt: Wo : LRZ-Secomat-Cluster Was : Weiterer Versuch den Secomat-Cluster zu erweitern. Betroffen sind priv. IP-Adressen im MWN. Zu Ausfaellen kommt es nicht, bei planmaessigem Verlauf. Wann: Dienstag, 23.08.2011 zwischen 7:30 Uhr - 8:30 Uhr Wo : Schellingstr. 3, Vordergebaeude, EG, 1.OG, 2.OG Was : Austausch des Switches im 1.OG und neu Patchung aller Leitungen im Verteiler Wann: Dienstag, 23.08.2011 von 7:00 Uhr bis 11:00 Uhr Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4089/ Helmut Troebs

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Upd:Update: HLRB-II login node back in production
by LRZ aktuell Aug. 19, 2011

Aug. 19, 2011

Changes to this message: Update Dear users of HLRB-II, the problems on the login node of HLRB-II have been fixed and it is back in production. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4088/ Hans-Georg Kleinhenz

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HLRB-II login node down
by LRZ aktuell Aug. 19, 2011

Aug. 19, 2011

Dear users of HLRB-II, the login node of HLRB-II is currently down. SGI support has been notified. Please use the alternate login node login2.hlrb2.lrz-muenchen.de to access your data and to submit jobs. We apologize for the inconvenience caused by this interrupt. This information is also available on our web server http://www.lrz-muenchen.de/services/compute/hlrb/aktuell/ali4088/ Hans-Georg Kleinhenz

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Upd:Einfuehrung von IPv6 im MWN
by LRZ aktuell Aug. 18, 2011

Aug. 18, 2011

Aenderungen an der Mitteilung: Fortschreibung des Zeitplans Wie bereits in frueheren Mitteilungen angekuendigt (https://lists.lrz.de/pipermail/aktuell/2011-March/000077.html) wird in den Netzen im MWN schrittweise IPv6 aktiviert, ausser es gibt Gruende dies nicht zu tun. Hier ist der Zeitplan der naechsten Wochen: KW34 (22.8.-26.08.) * Vlan705 BB 129.187.38.0 * Vlan733 BH 129.187.130.0 129.187.221.0 129.187.249.0 129.187.114.0 * Vlan734 BM 129.187.230.0 * Vlan743 BD 141.84.116.0 * Vlan767 YW 141.84.163.0 * Vlan769 BH,BB 129.187.53.0 * Vlan800 FG 141.84.50.0 * Vlan804 BE 129.187.152.0 KW35 (29.08-02.09.) * Vlan805 BI 129.187.119.0 * Vlan806 BT,BU 129.187.169.0 129.187.197.0 * Vlan807 BL 129.187.176.0 * Vlan808 BF 129.187.150.0 * Vlan809 FL 129.187.5.248 129.187.45.160 129.187.125.0 * Vlan853 BB 129.187.99.0 129.187.93.0 * Vlan883 B1 129.187.113.0 129.187.103.0 * Vlan897 HP 129.187.9.186 * Vlan906 ZD 129.187.55.230 129.187.19.30 KW36 (05.09-09.09.) * Vlan907 FE 129.187.19.48 141.84.48.0 * Vlan912 NH, NN, NM, NK 141.84.177.0 * Vlan915 NY, NT, NA, NL 141.84.174.0 * Vlan931 SB 141.84.81.0 * Vlan932 SA 141.84.80.0 * Vlan938 DP 192.68.211.0 * Vlan942 B1 129.187.141.0 * Vlan985 HA 129.187.5.200 * Vlan992 B4 129.187.194.0 * Vlan997 SB 194.95.59.0 KW37 (12.09-16.09.) * Vlan1741 BM 129.187.144.144 * Vlan1798 ST 141.84.164.0 * Vlan3500 BM 129.187.45.128 * Vlan3502 BB 129.187.135.0 * Vlan3504 BH 129.187.9.104 KW38 (19.09-23.09) * Vlan31 Hoersaele LMU 141.84.221.x * Vlan235 I,T 138.244.0.0 * Vlan269 ZT 141.84.247.0 KW39 (26.09-30.09) * Vlan326 DC 141.84.9.24 * Vlan362 OE 141.84.44.136 * Vlan452 TD 141.84.122.0 * Vlan454 OF 141.84.44.192 * Vlan744 OE 141.84.9.36 * Vlan745 OE 141.84.9.32 * Vlan746 OE 141.84.9.40 * Vlan747 OE 141.84.9.44 * Vlan875 OE 141.84.43.128 * Vlan894 ZA 129.187.19.240 Diese Information finden Sie im WWW unter http://www.lrz-muenchen.de/services/netz/aktuell/ali4021/ Wolfgang Beyer

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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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