RAL Tier1 Experiments Liaison Meeting

Wednesday 24 Mar 2021, 12:30 → 13:30 Europe/London

Access Grid (RAL R89)

Please attend via the following Zoom meeting:

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

 

12:38 → 12:39 Major Incidents Changes

12:39 → 12:40 Summary of Operational Status and Issues

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

RT1EL-20210324.docx

RT1EL-20210324.pdf

12:40 → 12:41 GGUS /RT Tickets

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

12:41 → 12:42 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

12:42 → 12:43 Experiment Operational Issues

12:44 → 12:45 VO-Liaison ATLAS

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

Hostname env for WN containers: https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=398494 
 - Open 2 weeks; hope to be deployed later this week?

RAL-LCG2_TEST job failures:
https://ggus.eu/index.php?mode=ticket_info&ticket_id=151098 
Used to push more analysis jobs through; submitted via Harvester central_B (not aCT). 
Job appears to terminate abruptly;

Number of "LRMS error: (-1) RemoveReason: Job removed by SYSTEM_PERIODIC_REMOVE due to job running more than once" errors;   likely ATLAS issue?

 

 

12:46 → 12:47 VO Liaison CMS

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

We have been running with a cap of 3k since the end of last week. We have a mix of Processing and Production jobs, and an average efficiency of ~50% in the last 5 days. This is following a fix by Tom Byrne in the middle of last week on the WN xrootd containers. I am pushing for 'permission' to increase this.

I am still seeing some jobs with the very low efficiencies (<1%), which eventually fail.

I have one of the premix libraries at RAL, so I am comparing the campaign using that dataset with other campaigns using premix offsite. So far there is no obvious advantage having the premix onsite...but I want to study it longer.

Firewall change not now expected until 21st April.

Vector read...don't know.

12:48 → 12:49 VO Liaison LHCb

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

LHCb

1. Number of running jobs at RAL
   - https://ggus.eu/?mode=ticket_info&ticket_id=150679
   - Still open, but solved now I suppose.

2. Some files fail to be downloaded at RAL
   - https://ggus.eu/?mode=ticket_info&ticket_id=150898
   - Data corruption issue affecting ~30 files
   - Many of the files deleted now.

3. ECHO streaming issue
   - https://ggus.eu/?mode=ticket_info&ticket_id=142350
   - Development of xrootd-ceph vector read interface ongoing
     - Testing against the gateways which have the fix for testing

DUNE

Nothing to report operationally.

- Interested in http(s) access to ECHO

12:52 → 12:53 VO Liaison Others

12:53 → 12:54 Experiment Planning

12:54 → 12:55 Dune/protoDune

12:55 → 12:56 Euclid

12:56 → 12:57 SKA

12:57 → 12:58 AOB

12:58 → 12:59 Any other Business

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