RAL Tier1 Experiments Liaison Meeting

Wednesday 2 Sept 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-20200902.docx

RT1EL-20200902.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))

20200902_ipv46_observations.pdf

AD to update Corepower

Currently running slightly under pledge (~97% from vande).

Tape deletions finished (for MCTAPE) ~ 2PB.  Data deletion discussion happening within ATLAS.
JW to send Rob A.  atlas dataset 'regex' statement.

 

TPC:

  Macroons - user caveats / endorsements don't appear to be taken into account. (might be due to how we patched the xrdhttpvoms for gridmapfile usage).

  Issue with uploading via curl; likely to have been same issue as xrdcp -f problem. Test xroot-ceph deployed on GW683 and seems to have resolved issue.

Transfer failures with gFAL mkdir problems not resolved yet; pragmatic solution to 'fix' the xrootd-ceph plugin.

 

13:46 → 13:47 VO Liaison CMS

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

ipv4_and_ipv6_comparison.pdf

ipv4_and_ipv6_comparison.pptx

Latest from Martin B on the network slowness with IPv4:

(Monday last week 24th Aug): They did a quick ping from outside and verified that they get no response from the various elements inside the border, which is what we see.  So they're poking the various boxes to allow ping et al through and at some point I hope they will tell me that it's possible to ping in to lcgui06  etc., and then we can test from outside.   Of course it is possible that in poking stuff they may find that there's a goof somewhere that when fixed will solve our problem.  Don't hold your breath.

(Tues/Wed last week): DI requested IP addresses for the affected source sites, so I sent a bunch over. 

I then sent further tests results from James W and Raja which supported my conclusions on IPv6 being much faster than IPv4. 

No further update (Mon/Tue this week were RAL holidays).

 

In other news, job efficiency has been up and down, largely between 30 and 60 % this week. High input read times are observed.

AAA SAM tests have been failing for a period approximately once per day, even when AAA isn't particularly busy. I haven't had time to look into this yet, but it's on my list.

13:48 → 13:49 VO Liaison LHCb

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

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))