RAL Tier1 Experiments Liaison Meeting

Wednesday 1 May 2024, 13:30 → 15:00 Europe/London

Access Grid (RAL R89)

14:00 → 14:01 Major Incidents Changes

14:05 → 14:06 Summary of Operational Status and Issues

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

Weekly Report 01 May 2024.docx

Weekly Report 01 May 2024.pdf

14:10 → 14:11 Experiment Operational Issues

14:15 → 14:16 VO Liaison CMS

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

Gsiftp now completely removed from CMS activities including WN uploads.

Tape REST API is in production and we see some successful davs transfers already. Katy is monitoring.

Antares updated to CTA 5 - no issues observed. 

Cap removed on 12k CMS cores running simultaneously - however I have not seen the number go above 12k in Vande. 

Concerning the DUNE usage of Echo - they acknowledge they went over pledge and are investigating (behaviour in Rucio, dark data and so on).

14:20 → 14:21 VO-Liaison ATLAS

Speakers: Dr Brij Kishor Jashal (RAL, TIFR and IFIC), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)

ATLAS T1 RAL_LCG2 notes

https://codimd.web.cern.ch/Az2O8j5tRuGbgTD_us8UWQ#

14:25 → 14:26 VO Liaison Others

14:30 → 14:31 VO Liaison LHCb

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

LHCb:

• First 2024 data arrived to RAL
• LHCb submitted huge WGProduction last week, it overloaded ECHO and resulted in many vector read failures
  
  • This indicates that chanes are indeed necessary
    • No prefetch was rolled-out to 2021 gen last Friday
    • In the long term we should aim for proxy removal, in my opinion
• Checksums stopped working on 3 WNs from the preprod farm
  
  • Due to tests
• Xrootd bug follow-up
  • Lists of affected files created

ALICE:

• Free space values in SRR does not match CRIC, needs correction (ticket CS-147)
  • Do we have working xrootd space reporting?

14:35 → 14:38 VO Liaison LSST

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

• LSST jobs running on batchfarm well
  • new job type added to utilise the Butler Metadata hosted at RAL
    • Currently failing due to configuration error but cannot correct until X509 user cert renewed
• LSST Rucio currently in scaled back operations due to DB issues with load
  • psycopg-binary for the client currently thought to be the issue
  • I have suggested it is more of a DB issue as I have seen the error on my instance when close to its maximum connections allowed

14:40 → 14:41 VO Liaison APEL

Speaker: Thomas Dack

14:45 → 14:46 AOB

14:50 → 14:51 Any other Business

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