RAL Tier1 Experiments Liaison Meeting

Wednesday 14 Apr 2021, 13:30 → 14:30 Europe/London

Access Grid (RAL R89)

Please attend via the following Zoom meeting:

https://cern.zoom.us/j/66811541532?pwd=L2k1RmpTd2RsMktpVllSSXRxV0Y1dz09

 

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-20210414.docx

RT1EL-20210414.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))

20210414_RAL_datathroughput_updates.pdf

13:46 → 13:47 VO Liaison CMS

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

SAM tests have been green in the last week. Tom Birkett is still looking at the 'missing' tests (see the AREX ggus ticket).

Excluding the LogCollect jobs, job failure rate is similar to other sites. Efficiency is still poor, I estimate it's 50% average for the week. 

With Chris Brew I am working on using ceph-gw9 as a 'firewall bypass' but this has not been as easy/quick as I had hoped! We have the xrootd service and certificates (renewal) working now, and ready to try some tests with jobs. 

This new plot made with Tom Byrne shows regular and vector reads from the CMS-only WNs. It's interesting as it seems to show some nodes (older ones?) with a limit of around 8 normal reads per second. Perhaps newer nodes have a higher limit. https://vande.gridpp.rl.ac.uk/next/d/W3N9lulMk/wn-gateway-vector-read-investigation?orgId=1&from=1618230409349&to=1618305889158

Katy has CMS computing week between 1-6/7pm Tues-Fri this week. 

13:48 → 13:49 VO Liaison LHCb

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

LHCb:

https://ggus.eu/index.php?mode=ticket_info&ticket_id=151081

• Title : CTA->RAL disk transfers failing    
• Issue : ECHO very slow in returning checksums when attempting transfers using xroot. Expected : <1s. Real value : ~60s

https://ggus.eu/index.php?mode=ticket_info&ticket_id=150898

• Title : Some files cannot be downloaded: bad ...    
• Issue : Data corruption at RAL. Origin not understood?

https://ggus.eu/index.php?mode=ticket_info&ticket_id=150653

• Title : FTS error: libX509SciTokensIssuer.so ...    
• Issue : RAL FTS does not support macaroons. FTS upgrade needed at RAL.
• Resolution : On hold. Waiting for upgrade (soon?).

https://ggus.eu/index.php?mode=ticket_info&ticket_id=142350

• Title : Proble accessing some LHCb files at RAL    
• Issue : xrootd vector reads from CEPH (ECHO@RAL) not properly implemented.
• Resolution : Next iteration of fix for testing soon.

 

DUNE:

Ticket(s) requesting access to all DUNE users for RAL data

• https://ggus.eu/?mode=ticket_info&ticket_id=151225
• https://ggus.eu/index.php?mode=ticket_info&ticket_id=151224
• Updated and resolved
• Checking with DUNE if the issue is solved.

 

 

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))