Difference: WLCGOpsMinutes130919 (26 vs. 27)

Revision 272013-09-23 - MaartenLitmaath

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META TOPICPARENT name="WLCGOpsCoordination"

WLCG Operations Coordination Minutes - 19 September 2013

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  • Remote: Alessandra Forti (chair), Alessandro Cavalli, Frederique Chollet, Helge Meinhard, Christoph Wissing, Pavel Weber, Massimo Sgaravatto, Daniele Bonacorsi, Isidro Gonzalez Caballero, Alessandra Doria, Gareth Smith, Di Qing, Michael Ernst

News

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Maarten and Maite introduce the proposal to start the WMS decommissioning task force, already foreseen since long, due to CERN's plans to decommission the WMS service as soon as practical. The residual usage comes from SAM, some small fraction of the LHC experiment jobs and smaller VOs (ILC, GEANT4). The task force will start by analysing the logs to exactly determine who are the users, and then to discuss alternatives with them. A twiki will soon be created, and volunteers are very welcome.
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Maarten and Maite introduce the proposal to start the WMS decommissioning task force, already foreseen since long, because of CERN's plans to decommission the WMS service as soon as practical. The residual usage comes from SAM, some small fraction of the LHC experiment jobs and smaller VOs (ILC, GEANT4). The task force will start by analysing the logs to determine exactly who are the users, and then to discuss alternatives with them. A twiki will soon be created, and other volunteers are welcome.
 
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About the ops tests, Maarten explains that WCLG will stop looking at them from January, but presumably they will still be run by EGI for their monitoring.
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About the ops tests, Maarten explains that WCLG will stop looking at them from January, but they will still be run by EGI for their monitoring.
  The task force is approved and its coordinators will be Maarten and Maite.
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  • new baseline version for dCache is 2.2.17, introducing SHA-2 support
  • new baseline version for StoRM is 1.11.2, in EMI-3. It fixes some known issues (also related to FTS 3) and supports SHA-2. Sites should upgrade
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Maarten adds that earlier this week a critical bug was discovered in the top BDII. Sites have been notified by EGI. A patch will be released next week (not this week, because an easy workaround is available); still, upgrading to the current latest version is advisable.
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Maarten adds that earlier this week a critical bug was discovered in the top BDII. Sites have been notified by EGI. A patch release is expected next week (not this week, because an easy workaround is available); still, upgrading to the current latest version is advisable.
 

Tier-1 Grid services

Storage deployment

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      • RRC-KI, SPbSU, IHEP (much reduced)

ATLAS

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  • arcproxy: due to the problems introduced by the new java version distributed with EMI-3 needed by e.g. voms-proxy-info, ATLAS has decided to replace its pilot calls with arcproxy ones. The latest problem (https://ggus.eu/ws/ticket_info.php?ticket=97230) is not easily solvable since java doesn't like the virtual memory being limited. Limiting the memory to keep out some memory hungry jobs is current practice at many sites. The minimum value sites can set the limit is not predictable as it looks to be connected to the amount of memory+swap. arcproxy is written in C++ and is considered more suitable for the WNs activity.
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  • arcproxy: due to the problems introduced by the new java version distributed with EMI-3 needed by e.g. voms-proxy-info, ATLAS has decided to replace its pilot calls with arcproxy ones. The latest problem (https://ggus.eu/ws/ticket_info.php?ticket=97230) is not easily solvable since java doesn't like the virtual memory being limited. Limiting the memory to keep out some memory hungry jobs is current practice at many sites. The minimum value sites can set the limit to is not predictable as it looks to be connected to the amount of memory+swap. arcproxy is written in C++ and is considered more suitable for the WNs activity.
 
  • webDAV: for DPM, as reported in the baseline versions which have been updated, the required version for ATLAS is DPM 1.8.7 .
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Maarten clarifies that the problem does not originate from the new Java version (EMI does not distribute Java) but from the latest voms client, which are written in Java instead of C++.
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Maarten clarifies that "the new Java version" refers to the new VOMS clients version written in Java instead of C++ (note that EMI does not distribute Java).
 

CMS

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  • LHCb: using FTS3 instance at CERN after the bugfix with the timestamps in transfer status output.

Tracking tools

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Maarten announces that the end of the year deadline for the decomissioning of Savannah will not be met due to other more urgent duties, but it was not a hard deadline anyway. Many complex problems still need migrating. Andrea V. adds that PH-SFT has very little manpower left on Savannah, it's already on best effort.
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Maarten announces that the end of the year target for the decommissioning of Savannah is unlikely to be met due to other more urgent duties, but it was not a hard deadline anyway. Many trackers still need migrating. Andrea V. adds that PH-SFT has very little manpower left on Savannah, it's already on best effort. These matters will be followed up offline.
 

IPv6

  • Motivation: the exhaustion of the IPv4 address space is starting to create problems to some sites (in particular CERN) and WLCG needs to have a strategy to become IPv6-ready on a timescale that fits with the needs of the sites and the experiments.
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    • dcache-plugin-xrootd-monitor-5.0.0.0-0.noarch
  • This plugin is mandatory to enable the detailed monitoring stream from the dCache sites having joined the XRootD federations (AAA, FAX).
  • NB: this version is suitable for dCache versions v. >= 2.4
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    • For dCache versions v. <= 2.2 the installation of xrootd4j-backport plugin is additionally needed (not distributed in the current RMP)
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    • For dCache versions v. <= 2.2 the installation of xrootd4j-backport plugin is additionally needed (not distributed in the current RPM)
 
      • dedicated RPMs including xrootd4j-backport will be made soon available in the WLCG repo for dCache versions v. <= 2.2

gLExec

 
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