RAL Tier1 Experiments Liaison Meeting

Wednesday 14 Oct 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-20201014.docx

RT1EL-20201014.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))

*  Data tape deletions continuing. Recommend that Repack should start with MC pools, until the deletions complete at least.

* Repack: need discussion on atlasinapp(sim)? Other strategies ?

* ATLAS could replicate LHCb issue of user problem stat-ing files in echo:
  - Only "read" access is given in the auth file. "Lookup" permissions ("l"), would need to be added.
 - Would allow attempts to 'stat / ls' non-existent files to pass through the 'auth' level  ... 
  

* TPC-HTTP work continuing; 
  - likely source of current problem in mismatched stripe_width / 'data-chuck' input sizes.
 - Experts believe fix is 'minor'; might be related to some other (non-RAL) issues observed.

* "ATLAS Operations During Lockdown" in GridPP:
 - if there's any feedback that the Tier-1 would like to give on ATLAS / VO operations, please let me know. (Darren I think gives the equivalent Tier-1 report).

 

* Status of Firewall problem on WNs update ... 
https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=356152 (and a related DI request).

* different content of CVMFS depending on the UI host:
https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=364772

 

13:46 → 13:47 VO Liaison CMS

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

13:48 → 13:49 VO Liaison LHCb

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

LHCb :

1. LHCb sl7 VO-box : Waiting for service certificate
2. LHCb user file access issue :
   • Affected only users without lhcbprod access
   • Seen for all VOs
   • Problem with listing files - fixed by adding listing to list of permissions.
     • Many thanks to Marcello for finding this out
     • Being added to aquilon by Marcello.
3. LHCb streaming issue
   • Work ongoing to fix streaming vector reads
   • Better understanding now of some of ECHO block size parameters
     • Going to test block sizes as low as 4KB
     • Waiting on fixes to the CEs to enable running explicitly on the test WNs
       • 2 - 3 weeks to get this running. Testing possible only after this.

DUNE

1. No specific news from DUNE ops meeting.
2. Long time since any significant production has been run

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))