RAL Tier1 Experiments Liaison Meeting

Wednesday 8 Apr 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-20200407.docx

RT1EL-20200407.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))

Monday evening; several unrelated problems:
RAL panda queue  set offline with HC tests: source was identified as aipanda051 machine - fixed
    – related to a big cleanup of obsolete fields in preparation for CRIC.

Hammercloud test job 'stuck';  RAL Set back online manually - jobs starts swiftly:
example case: https://bigpanda.cern.ch/job?pandaid=4695356067 

000 (5342341.000.000) 04/07 22:13:18 Job submitted from host: <130.246.180.236:9618?addrs=130.246.180.236-9618&noUDP&sock=6566_8841_3>
...
001 (5342341.000.000) 04/08 07:46:59 Job executing on host: <130.246.217.81:9618?addrs=130.246.217.81-9618&noUDP&sock=2529_431a_3>

Needs to be understood, if possible; else risk of HC unable to whitelist.

https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=253926 

 

Covid-19:

 - ATLAS now seems to have much infrastructure inplace;
  Runs F@H containers as analysis-like job
New voms role to atlas: /atlas/covid/Role=Production and Rucio scope
has own global share of resources and dedicated queue (at CERN currently)

Monitoring and accounting provided within existing infrastructure

 

13:46 → 13:47 VO Liaison CMS

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

No significant op problems. Tidying up some 'stuck' tape transfers to/from RAL tape over the last few months. Many are too old to look into the possible cause. 

Made a change to the 'batch allotment' with Tom. We tried to put all xrootd functionality into one docker container (xrootd-proxy) but this didn't work. Unlike LHCb, for whom this is being trialled currently and working well, CMS has an additional problem with the LFN2PFN. So we think we need to keep both xrootd servers working. As this change did not work, instead we changed 

xrootd.async segsize 4194304

xrd.buffers maxbsz 4194304

These were previously 64 MB -> now 4 MB. This is a big change, but hopefully means we will notice a difference, whether positive or negative, quickly.

13:48 → 13:49 VO Liaison LHCb

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

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))