RAL Tier1 Experiments Liaison Meeting

Wednesday 23 Jul 2025, 13:30 → 15:50 Europe/London

Access Grid (RAL R89)

13:30 → 13:31 Experiment Operational Issues

13:35 → 13:40 ATLAS Operations Report

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

13:40 → 13:45 CMS Operations Report

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

Spotted 25% of CMS transfer from Echo to Antares failing. ATLAS had the same. Only IPv4 transfers were failing and not all of them. IPv6 was 100% successful. At first guessed it was related to Antares upgrade/new hardware, but then asked Jyothish and he quickly proved it was missing IPv4 routes to Antares from the new 23 tranche of Echo gateways. These are now blacklisted and Jyothish is following up with DI. In the meantime the failures stopped. 

There is clearly Antares data moving using IPv6. But because the current MGM does not have a publicly routable IPv6 address (quote: George) the CMS SAM tests remain in warning state. 

There have been some issues with the new ETF tests (token) for ARC-CEs, which were briefly included in the Site Status. These have now been removed from Site Status until better stability is achieved. Errors have been 'corrected' by CMS. 

The possible network issue stopping jobs being submitted from Schedds at FNAL seems to have been solved. So far as we know nothing was changed on the RAL or the FNAL side. But we can now do traceroute etc. to the relevant machine(s). 

13:45 → 13:50 LHCb Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

13:50 → 13:55 ALICE Operations Report

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

13:55 → 14:00 LSST Operations Report

Speakers: Mathew Sims, Timothy Noble (Science and Technology Facilities Council STFC (GB))

• ComCam data (ccms1) now at RAL as well as being moved from RAL to Lancs as well
  • Being ingested into the metadata service (Butler now)
  • My anticipation is that this dataset will be run in August after the LSST Community Workshop next week
• RC2 and DC2 data retrieved to US and confirm configuration and return processes
  • Now to run a coordinated DC2 and RC2 run at all 4 sites (4x2) return all the data and investigate results for deviation
• Will move message stack from Cloud to VMWare / Proxmox to ensure stability of this going forwards
• Working with Edinburgh to facilitate the set up of the access centre for astronomers
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14:00 → 14:01 Tier-1 Projects

14:15 → 14:25 Anatares Upgrade

New EOS nodes
Repack Progress

Speakers: George Patargias, Thomas Byrne

14:25 → 14:35 XRootD Development

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

'23 gen -> antares broke, currently blacklisted

14:35 → 14:45 Utilizing GPUs

Speakers: Jyoti Prakash Biswal (Rutherford Appleton Laboratory), Thomas Birkett

14:45 → 14:50 SSD Storage Evaluation

14:50 → 14:55 Echo deployment

15:00 → 15:01 AOB

15:01 → 15:10 Summary of Operational Status and Issues

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

Weekly Report 23 July 2025.docx

Weekly Report 23 July 2025.pdf

15:10 → 15:15 Any other Business

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