RAL Tier1 Experiments Liaison Meeting

Wednesday 12 Aug 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 of the week

13:40 → 13:45 CMS Operations Report

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

Katy is on leave for a few days - report written on Monday. 

SAM tests:

• Problem with the European redirector on Friday - reported and fixed Friday
• Problem with ETF tests unable to do IPv6 on storage endpoints - reported and fixed Monday
• Both issues fixed on the CMS side

 

Production:

• NtR

 

AAA machinery: 

• No further update, keeping the new machines in prod.

 

/unmerged:

• Deletion still on-going - Jyothish can you please check this is the case. 

 

 

13:45 → 13:50 LHCb Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

jobs.png

transfers_from.png

transfers_to.png

Alex is on leave.

Operational issues:

• Failed transfers from Antares to ECHO last night
  • Seems to be caused by connection problems to Antares
• Many upload failures from RAL WNs to ECHO GGUS:1003466
  • Fix deployed, checksums are now correctly retrieved from file's attributes across the whole farm.
• High failure rate for Simulation jobs
  • Improving, but slowly (still have a lot of old productions)

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))

• LSST Jobs failing for nealy a month - no longer
  • Patch to prevent filename length exceeding 285 applied
    • LSST filename / path more than 285, so data could be stat'd but not read - causing a headache for US and Me
  • Repatched yesterday to exceed this up to 1021
  • Interestingly Jyothish found this limit would have been 2048 normally, untill we added monitoring
• No monitoring at SLAC right now as cert expiry and new CA at SLAC have lead to OS service being offline for a while as we figure out how to get the certs with the correct attributes to allow OpenSearch to run

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 AOB

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 12 August 2026.docx

Weekly Report 12 August 2026.pdf

15:00 → 15:05 Any other Business

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