RAL Tier1 Experiments Liaison Meeting

Wednesday 19 Jul 2023, 12:30 → 14:30 Europe/London

Access Grid (RAL R89)

13:00 → 13:01 Major Incidents Changes

13:01 → 13:02 Summary of Operational Status and Issues

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore (Science and Technology Facilities Council STFC (GB)), Kieran Howlett (STFC RAL)

Weekly Report 19 July 2023.docx

Weekly Report 19 July 2023.pdf

13:02 → 13:03 GGUS /RT Tickets

https://tinyurl.com/T1-GGUS-Open
https://tinyurl.com/T1-GGUS-Closed

13:04 → 13:05 Site Availability

https://lcgwww.gridpp.rl.ac.uk/utils/availchart/

https://cms-site-readiness.web.cern.ch/cms-site-readiness/SiteReadiness/HTML/SiteReadinessReport.html#T1_UK_RAL

http://hammercloud.cern.ch/hc/app/atlas/siteoverview/?site=RAL-LCG2&startTime=2020-01-29&endTime=2020-02-06&templateType=isGolden

13:05 → 13:06 Experiment Operational Issues

13:15 → 13:16 VO Liaison CMS

Speaker: Katy Ellis (Science and Technology Facilities Council STFC (GB))

Testing with the new Echo redirector : webdav worked fine for CMS FTS transfers but root (e.g. Antares to Echo) is failing. James W knows why...may need further work.  Katy reverted the xrootd part of the testing but kept the webdav. 

CMS has requested to move to Tape REST API (i.e. davs transfers instead of root for tape) but may be worth keeping root until the above is tested at (CMS) scale. 

Following the virtual move of a storage rack from the old to new networks, the move of the new network/LHCONE traffic to the OPN has been done today at 13:00. Observations will happen, with CMS to have cap of 6k cores possibly released early next week. 

There are failing transfers between CERN and RAL Echo for all VOs since yesterday - possibly related to the network changes, although James A says it's probably internal to CERN - needs to be escalated. 

CMS to test RAL FTS...but waiting until some of the above is in better working order. 

13:16 → 13:17 VO-Liaison ATLAS

Speakers: James William Walder (Science and Technology Facilities Council STFC (GB)), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)

13:20 → 13:21 VO Liaison LHCb

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

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Tickets:

• Host certificate for the vo-box
  • Solved
• Slow stats
  • No updates
• DNS issue (redirector setup)
  • lhcb is going to start using new redirector for https transfers next Monday
• Vector read
  • Tests of the new xrootd config with prefetch off are ongoing on lcg2642
  • Since the retirement of 2017s for LHCb failure rate seems to be reduced

Operational issues:

• Transfers from CERN to ECHO are not working
  • IPv6 traffic seems to be blocked somewhere near CERN
• Upload failures from RAL's WNs to ECHO
  • Most probably due to usual gateway problems

13:25 → 13:28 VO Liaison LSST

Speaker: Timothy John Noble (Science and Technology Facilities Council STFC (GB))

13:30 → 13:31 VO Liaison Others

13:31 → 13:32 AOB

13:32 → 13:33 Any other Business

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore (Science and Technology Facilities Council STFC (GB))