Name: RAL Tier1 Experiments Liaison Meeting
Start: 2025-05-07T13:30:00+01:00
End: 2025-05-07T15:50:00+01:00
Location: RAL R89

- 13:30
  
  Experiment Operational Issues
- 1
  
  ATLAS Operations Report
  
  Speakers: Brij Kishor Jashal (Rutherford appelton laboratory), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)
  
  ATLAS liason meeting notes Brij
- 2
  
  CMS Operations Report
  
  Speaker: Katy Ellis (Science and Technology Facilities Council STFC (GB))
- 3
  LHCb Operations Report
  
  Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)
  
  jobs.png
  
  transfers_from.png
  
  transfers_to.png
  Issues:
  
  ECHO instability last Wednesday
  
  Resulted in failed transfers/job uploads/downloads, and, most annoyingly, in file loss (GGUS 683184)
  
  Due to race conditions between https and root protocols
  
  There should be a way to mitigate this, e.g.
  
  Poison DNS entry for webdav.echo.stfc.ac.uk on WNs (for LHCb jobs at least), so that it is redirected to local gateway as well
  
  Introduce some locking/protection (e.g. do not execute delete if it arrived more than N minutes ago)?
- 4
  
  ALICE Operations Report
  
  Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)
- 5
  LSST Operations Report
  
  Speakers: Mathew Sims, Timothy Noble (Science and Technology Facilities Council STFC (GB))
  LSST jobs from latest pipeline failing,
  
  We think currently this is due to the job pulling in the instructions (QG), writing out to echo any changes, then reading locally and complaining its changes were not there. - Contacting Middleware team about this.
  
  Moving data to 'correct' location on echo, started on Friday and moved 220,000 files so far with originals and copies checksumed and if they matched old one deleted.
- 14:00
  
  Tier-1 Projects
- 6
  
  Anatares Upgrade
  
  New EOS nodes
  Tape Robotics downtime
  
  Speakers: George Patargias, Thomas Byrne
- 7
  
  XRootD Development
  
  Speakers: Alexander Rogovskiy (Rutherford Appleton Laboratory), Jyothish Thomas (STFC)
- 8
  
  Utilizing GPUs
  
  Speakers: Jyoti Prakash Biswal (Rutherford Appleton Laboratory), Thomas Birkett
- 14:45
  
  AOB
- 9
  
  Summary of Operational Status and Issues
  
  Speakers: Brian Davies (Lancaster University (GB)), Darren Moore
  
  Weekly Report 07 May 2025.docx
  
  Weekly Report 07 May 2025.pdf
- 10
  
  Any other Business
  
  Speakers: Brian Davies (Lancaster University (GB)), Darren Moore

RAL Tier1 Experiments Liaison Meeting

Access Grid

RAL R89