RAL Tier1 Experiments Liaison Meeting

Wednesday 25 Mar 2026, 13:30 → 15:50 Europe/London

Access Grid (RAL R89)

1 Site Operations

13:34 Experiment Operational Issues

2 ATLAS Operations Report

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

ATLAS liason meeting notes Brij

3 CMS Operations Report

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

Katy is still at CERN until tonight, for the OTF. The topics are:

Tuesday - XRootD, some really nice talks, especially from Guilherme on why XRootD is used in HEP, and some very pleasing improvements for version 6.0 and beyond.

Wednesday (this afternoon) - new accounting PEAR, CRIC, and DC27 discussion of dates and scope.

 

Operations: SAM tests failing for data-access type tests using certificates. Restart of the AAA servers has not helped. I can access the file one of the tests is trying to use, and download it using gfal-copy. Jyothish is also investigating. 

Issue with /unmerged/ files (some, not all?) not being cleaned up. The CMS system relies on a search of the /store/unmerged/ directory...of course this does not apply on Echo, so the system will never work. Jyothish is deleting everything from 2024 and before, which will free some space. We will discuss future treatment when I'm back. 

4 LHCb Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

News:

• LHCb requested to verify pledges and their deployment timescale GGUS:1002186
  • LHCb is a bit low on disk

Operational issues:

• ECHO rack power outage last Monday evening
  • Caused massive transfer and job failures
  • Fixed within a couple of hours
• Failed transfers from PIC to RAL-ECHO
  • These are the tests of the new tape library at PIC that i am doing
    • PIC asked to test tape recalls, and at the same time discouraged the used of their local disk SE, hence RAL is used as a destination
  • Seems to be a certificate problem on one of the PIC servers
  • The failures can be safely ignored
• A few buggy productions submitted yesterday
  • Many jobs were killed due to memory excess

5 ALICE Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

6 LSST Operations Report

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

• I am back
• Little LSST work (jobs) have been done in the UK not just RAL
  • Will be catching up on SLAC slack to figure out why, and if there is anything I need to do for RAL to be up-to-date
  • 
• 14.2 TB transfered in the last week
  
• 42TB moved since my last report:
  
•  

14:00 Tier-1 Projects

7 Antares Upgrade

Speakers: George Patargias, Thomas Byrne

8 XRootD Development

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

9 Utilizing GPUs

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

Brij GPU usage notes

14:25 AOB

10 Summary of Operational Status and Issues

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

Weekly Report 25 March 2026.docx

Weekly Report 25 March 2026.pdf

11 Any other Business

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