RAL Tier1 Experiments Liaison Meeting

Wednesday 3 Jun 2020, 13:30 → 14:30 Europe/London

Access Grid (RAL R89)

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-20200603.docx

RT1EL-20200603.pdf

Kernel and errata reboot campaign ongoing

SL6to SL7 migration ongoing

Migration campaign from nagger and ganglia ongoing

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))

20200603_TapeStudy01.pdf

May:   181k vs 156k (pledged)
CPU wall time ratio 56%

TPC: running in stress-test and on correct (test)gateway.
Transfers from RAL working well; Transfers to RAL not working (previously had)
 

Analysis jobs now set to use DirectIO; will collect some stats and report back.

  

13:46 → 13:47 VO Liaison CMS

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

RAL_jobEfficiency_3June2020.pdf

RAL_jobEfficiency_3June2020.pptx

13:48 → 13:49 VO Liaison LHCb

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

LHCb:

1. Singularity issue of last week solved after James Adams re-enabled namespaces
2. ECHO streaming testing
   • Some issues with the LHCb test system monitoring
   • Verified that XRD_STREAMTIMEOUT variable has no effect on error rate
   • Next : move to using mrmory proxy on the test WNs
     • First run for a day ot two with the XRD_STREAMTIMEOUT variable reverted to get a baseline failure rate again and be sure nothing changed.
     • Then switch to memory proxy
   • LHCb week next week - national computing board discussion on this is probable
3. Some reduction in running jobs at RAL today. Trying to understand if it is an LHCb effect.

DUNE

1. User space to be enabled some time this week.
2. Country-wide fraction of pledged resources available with Andrew McNab.
   • Part of a much bigger document?
   • Will forward when made available
3. Low aactivity from DUNE
   • No production jobs. A few user jobs
   • Clear indication that even at low load fewer jobs are coming to RAL vs other sites.
     • Investigating again.

Other stuff

• Following up on arc-v6 technical meeting. RAL-PPD already running arc-v6.

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))