RAL Tier1 Experiments Liaison Meeting

Wednesday 10 Apr 2024, 13:30 → 15:00 Europe/London

Access Grid (RAL R89)

14:00 Major Incidents Changes

1 Summary of Operational Status and Issues

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

Weekly Report 10 April 2024.docx

Weekly Report 10 April 2024.pdf

2 GGUS /RT Tickets

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

3 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 Experiment Operational Issues

4 VO Liaison CMS

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

5 VO-Liaison ATLAS

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

ATLAS_DATATAPE.png

ATLAS_MCTAPE.png

• The new full time liaison, Brij is here!

 

• Regarding the ATLAS Tape usage:
  • Total Pledge: ~71.4 PB.
  • MC TAPE Storage ~43.7 PB; Used  ~34.4 PB.
  • DATA TAPE Storage ~27.7 PB; Used ~22.0 PB.
  • Year-wise plots are attached. 
  • Links: WLCG; T1_MCTAPE; T1_DATATAPE.
  • Due to ongoing data taking, one could expect more writes to the tape?
  • Not aware of any upcoming large write/deletion campaigns! 
    • DAOD obsolescence Campaign (upcoming?/done): Data; MC.
    • The analysis groups were asked to have their say by 26 March --> ~5 PB! 

 

• QMUL GridPP Data Centre refurbishment:
  • At least 2 months of down time (July and August).
  • May extend to end of September => 01 July to 30 September downtime booked. 
    
  • Will be unable to offer any kind to services.
  • 8.66 PB DATADISK; 311 TB LOCALGROUPDISK; 449 TB SCRATCHDISK.
    
  • Several satellite sites will be directed back to RAL during last/first week of April/May.
    
  • What other actions are needed from RAL?
    

 

• RAL has been running <60% of its pledge since yesterday, job accounting link.
  

 

6 VO Liaison LHCb

Speaker: Alexander Rogovskiy (Rutherford Appleton Laboratory)

lhcb_tape.pdf

• No open GGUS tickets!
• Proxy for ETF tests expired
  • Tests for all sites are failing as a result
• Vector read optimisation
  • Change is ready to deploy
  • What's other VOs opinion on this
• Copying of the archive data from RRCKI is almost finished
  
  • That's half of all data, other files will be copied from other SEs
• Half of the batch farm is draining
  
  • LHCb has significantly less jobs as a result
• Antares SRR accounting
  
  • Can we add disk buffer space reporting?
• ECHO pledges
  • LHCb pledge is still from 2023 FY (above the current pledbe by ~600TB)
    • Are we going to reduce it?

7 VO Liaison LSST

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

8 VO Liaison Others

14:31 AOB

9 Any other Business

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