RAL Tier1 Experiments Liaison Meeting

Wednesday 7 Feb 2024, 13:30 → 15:00 Europe/London

Access Grid (RAL R89)

14:00 → 14:01 Major Incidents Changes

14:01 → 14:02 Summary of Operational Status and Issues

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore, Kieran Howlett (STFC RAL)

Weekly Report 07 February 2024.docx

Weekly Report 07 February 2024.pdf

14:02 → 14:03 GGUS /RT Tickets

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

14:04 → 14:05 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

14:05 → 14:06 Experiment Operational Issues

14:15 → 14:16 VO Liaison CMS

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

Tokens have been re-enabled at RAL as of this morning. I will try to get RAL included in CMS Rucio transfers with tokens.

CMS did a big pre-DC24 test yesterday. Test did not reach the desired rates - to be analysed where we (CMS/sites) need to improve.

OPN is broken - hopeful of a fix in next days.

Katy got traceroutes done for JA and JW, from a CMS storage node at CERN to RAL - JA thinks this will be useful.

DC24 starts Monday! RAL Echo will be heavily involved throughout the whole 2 week period. 

14:16 → 14:17 VO-Liaison ATLAS

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

• Token usage:
  
  • Changes deployed and gateways restarted.
  • Tokens re-enabled.
  • The FTS side fix provides sufficient protection to enable it in production -- an additional fix on XRootD side is being worked on with an ETA  (~a month).
  • The reopened GGUS ticket (164676) is closed after the success of the recent SAM test. 
    

 

• DC24 preparedness for next week:
  
  • Any particular thing to keep in mind?
  • Alessandra will be performing the tests?
  • A pre-DC full dress rehearsal with the flexible rates planned for today, 12:30-18:30 hrs (CERN time). This is to test the FTS limitations.
    • Actually kicked-off at 13:10 hrs. 

14:20 → 14:21 VO Liaison LHCb

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

LHCb:

• Token setup is finished.
• DC24 next week.
• Checksum library deployment postponed.

ALICE:

• TPC transfer problem
  
  • Seem to be due to EOS connection reuse
    • Connections become "stale" at some point, after that CERN EOS does not accept any packets from Antares hosts
    • George P asked EOS support how to turn off connection reuse
    • If data export (which starts soon) is done continuously, it might not be affected by the issue.
• Drained yesterday because of the database upgrade

14:25 → 14:28 VO Liaison LSST

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

14:30 → 14:31 VO Liaison Others

14:31 → 14:32 AOB

14:32 → 14:33 Any other Business

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore