RAL Tier1 Experiments Liaison Meeting

Wednesday 16 Dec 2020, 13:30 → 14:30 Europe/London

Access Grid (RAL R89)

Please attend via the following Zoom meeting:

https://ukri.zoom.us/j/98562731547?pwd=UU9Wb2xCL05tWmROT1h6SUlWdUJ3dz09

13:38 → 13:39 Major Incidents Changes

13:39 → 13:40 Summary of Operational Status and Issues

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

RT1EL-20201216.docx

RT1EL-20201216.pdf

13:40 → 13:41 GGUS /RT Tickets

https://tinyurl.com/T1-GGUS-Open
https://tinyurl.com/T1-GGUS-Closed

13:41 → 13:42 Site Availability

https://lcgwww.gridpp.rl.ac.uk/utils/availchart/

https://cms-site-readiness.web.cern.ch/cms-site-readiness/SiteReadiness/HTML/SiteReadinessReport.html#T1_UK_RAL

http://hammercloud.cern.ch/hc/app/atlas/siteoverview/?site=RAL-LCG2&startTime=2020-01-29&endTime=2020-02-06&templateType=isGolden

13:42 → 13:43 Experiment Operational Issues

13:44 → 13:45 VO-Liaison ATLAS

Speakers: James William Walder (Science and Technology Facilities Council STFC (GB)), Dr Tim Adye (Science and Technology Facilities Council STFC (GB))

MCTAPE Deletion continuing; expected to finish imminently.
 - ATLAS starting internal discussions on deletion campaigns for 2021.

 

13:46 → 13:47 VO Liaison CMS

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

13:48 → 13:49 VO Liaison LHCb

Speaker: Raja Nandakumar (Science and Technology Facilities Council STFC (GB))

DUNE:

• All WLCG sites passing ETF tests (except Bristol, but that is being followed up).
• OSG sites to be followed up on next month / year.

LHCb:

1. ECHO streaming issue :
   • Tests ongoing with very small buffer sizes on WN xrootd proxy and gateway configurations.
     • Initial results not very good, but retain this configuration and check back next year
   • Waiting for further news about xrootd vector read development.
2. Authentication issue for users (more than one) accessing files on ECHO
   • GGUS ticket https://ggus.eu/?mode=ticket_info&ticket_id=149909
   • Causes failure right at the beginning of file access for jobs running on RAL WNs
   • Same users are able to access the files when running root interactively on lxplus (or anywhere else)
   • Possible server certificate  issue?
   • xrootd debug logs (thank you to LHCb user!) in above GGUS ticket
3. Testing xrootd5
   • Many thanks to George and Chris
   • Errors seen (discussed in email thread)
4. LHCb also entering holiday period now
   • No further releases of DIRAC until next year

13:52 → 13:53 VO Liaison Others

13:53 → 13:54 Experiment Planning

13:54 → 13:55 Dune/protoDune

13:55 → 13:56 Euclid

13:56 → 13:57 SKA

13:57 → 13:58 AOB

13:58 → 13:59 Any other Business

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