RAL Tier1 Experiments Liaison Meeting

Wednesday 27 Jan 2021, 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 Major Incidents Changes

1 Summary of Operational Status and Issues

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

RT1EL-20210127.docx

RT1EL-20210127.pdf

2 GGUS /RT Tickets

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

3 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 Experiment Operational Issues

4 VO-Liaison ATLAS

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

GGSU: 150312(closed); Problems with Rucio update and staging files from tape. Central issue and hot-fix applied.

Drop in ATLAS jobs yesterday evening; no obvious attribution to RAL problems; similarly not aware of ATLAS issues. Recovering now.

Test gateway accidentally added to production davs transfers (rather than for FT).
- performance not great. 

5 VO Liaison CMS

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

One problem to chase up this week with the intermittent SAM test failures (xrootd access test). This looks for a file at RAL, but via AAA global redirector. It's not clear from the test debug messages, but I suspect a timeout. If the file is only coming from Echo, as it should be, then I see no reason why this is happening. I need to find the full job logs to investigate.

No updates/changes on other matters.

6 VO Liaison LHCb

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

LHCb:

• LHCb File access issue on ECHO :
  • GGUS ticket closed
  • Development on LHCb side to use later versions of xrootd (>=4.10)
  • Some edge cases still ongoing
• ECHO streaming issue:
  • Waiting for development of xrootd-ceph interface
  • Still investigating mitigation possibilities
• Slow drop in LHCb jobs over the last few days
  • Seems to have largely recovered now (last 24 hours).

DUNE:

Nothing particular to report.

7 VO Liaison Others

13:53 Experiment Planning

8 Dune/protoDune

9 Euclid

10 SKA

13:57 AOB

11 Any other Business

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