RAL Tier1 Experiments Liaison Meeting

Wednesday 4 Nov 2026, 13:30 → 15:50 Europe/London

Access Grid (RAL R89)

13:30 → 13:34 Site Operations

13:34 → 13:35 Experiment Operational Issues

13:35 → 13:40 ATLAS Operations Report

Speakers: Brij Kishor Jashal (Rutherford Appleton Laboratory), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)

Brij ATLAS liason meeting notes

13:40 → 13:45 CMS Operations Report

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

13:45 → 13:50 LHCb Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

News:
 - Staging campaign delayed, due to disk space shortage at some Tier-1s (not RAL)

Operational issues:

• A few buggy MC productions submitted with incorrect CPU time limit; most of jobs from these productions are killed by pilots
  • LHCb is working to fix these productions, hopefully no new ones should arrive
• There were some failed attempts to remove data from RAL-ARCHIVE when the storage was banned for removal in DIRAC (that's the common practice to ban removal from archival SEs)
  • Not our fault, obviously

13:50 → 13:55 ALICE Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

13:55 → 14:00 LSST Operations Report

Speakers: Thomas Birkett, Timothy Noble (Science and Technology Facilities Council STFC (GB))

• DB changes do not seem to have improved performance of Jobs
  • Will continue working with DB team
• jobs continuing to run at RAL
  • With some retries due to DB not respondinig to complex queries in time
    
• 2.6TB transferred into RAW - indicating continued data flow from Observatory
  

14:00 → 14:01 Tier-1 Projects

14:05 → 14:10 XRootD Development

Speakers: Alexander Rogovskiy (Rutherford Appleton Laboratory), Jyothish Thomas (STFC)

14:15 → 14:20 Utilizing GPUs

Speakers: Dr Brij Kishor Jashal (Rutherford Appleton Laboratory), Thomas Birkett

14:25 → 14:45 Hardware deployment

Echo SN
WN
GPU

Speaker: Jacob Ward

14:45 → 14:46 DC 27

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

14:50 → 14:59 Summary of Operational Status and Issues

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

Weekly Report 04 November 2026.docx

Weekly Report 04 November 2026.pdf

15:00 → 15:05 Any other Business

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

15:15 → 15:16 AOB