RAL Tier1 Experiments Liaison Meeting

Wednesday 13 Mar 2024, 13:30 → 15:00 Europe/London

Access Grid (RAL R89)

14:00 → 14:01 Major Incidents Changes

14:01 → 14:02 Summary of Operational Status and Issues

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore, Kieran Howlett (STFC RAL)

14:02 → 14:03 GGUS /RT Tickets

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

14:04 → 14:05 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

14:05 → 14:06 Experiment Operational Issues

14:15 → 14:16 VO Liaison CMS

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

Discussion of pilot overloading with Tom Birkett. https://ggus.eu/index.php?mode=ticket_info&ticket_id=165455 Tom says the VO can do whatever they want within the pilot. On the CMS side, I have no evidence either way on whether it's working well.

Tom also described token progress on the CEs, reasoning for taking Rocky8 instead of Rocky9, and plans for roll-out of IPv6 on the batch farm.

CMS SAM tests were ok this week - just one red day on Saturday caused by a single ceph gw having lost the abillity to authenticate. 

14:16 → 14:17 VO-Liaison ATLAS

Speakers: James William Walder (Science and Technology Facilities Council STFC (GB)), Jyoti Prakash Biswal (Rutherford Appleton Laboratory)

• GGUS:165529:
  • T0-T1 test repetition (RAL-LCG2); in progress.
  • Statements:
    • The tape challenge in 2021 was done using the standard DATATAPE so there is a precedent on using standard tape RSEs for these tests.
    • There should be enough space because the pledges have just been updated.
  • Questions for RAL:
    • The test will keep on rewriting the same files - usually on disk they are deleted.
      • What happens if we delete a file and rewrite it after?
      • Is there any intelligence that will prevent this from happening (and reuse the old one already present) or is rewrite on tape allowed?
    • Do we need a different path? The test RSE exists in CRIC and can be adapted.
    • Antares people (George and Tom) have been included to the ongoing discussions.
      

 

• Post-DC24 exercises (final schedule):
  
  • Repeating the T0 export tests, i.e., traffic only from T0 -> T1s.
  • Run for 6 hours per T1 to achieve the isolated DC24 target rates for them.
    
  • Mon, 11 March: IN2P3 // Tue, 12 March: FZK // Wed, 13 March: NDGF // Thu, 14 March: BNL // Fri, 15 March: CNAF // Mon, 18 March: RAL // Tue, 19 March: PIC // Wed, 20 March: TRIUMF // Thu, 21 March: All T1s together.
    
  • Link to all these GGUS tickets.

 

• Local discussions on tape family: STAH-76.
  
  • We are likely to apply a mapping between projects + data_type and the associated tape family / pool to which the data is assigned to (same as last year). 

14:20 → 14:21 VO Liaison LHCb

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

jobs.png

transfers_from.png

transfers_to.png

LHCb:

• Checksum ticket
  • Fix was deployed on Monday, looks OK
    • need a confirmation from LHCb
• Failed uploads last Saturday
  
  • Due to one problematic gateway
• Dark data removal almost finished
  
  • One chunk left, to be removed by Ian Johnson

 

Alice:

• TPC test issue
  • Keepalive config was rolled out to Antares prod yesterday
    
    • Looks OK since then

14:25 → 14:28 VO Liaison LSST

Speaker: Timothy John Noble (Science and Technology Facilities Council STFC (GB))

14:30 → 14:31 VO Liaison Others

14:31 → 14:32 AOB

14:32 → 14:33 Any other Business

Speakers: Brian Davies (Lancaster University (GB)), Darren Moore