US ATLAS Computing Facility


Facilities Team Google Drive Folder

Zoom information

Meeting ID:  996 1094 4232

Meeting password: 125

Invite link:



    • 1:00 PM 1:10 PM
      WBS 2.3 Facility Management News 10m
      Speakers: Robert William Gardner Jr (University of Chicago (US)) , Dr Shawn Mc Kee (University of Michigan (US))

      The pre-GDB Data Center Network Architectures workshop was held Monday and Tuesday of this week:  (Some details about AGLT2 network update/downtime are in Shawn's presentation from Monday).



    • 1:10 PM 1:20 PM
      OSG-LHC 10m
      Speakers: Brian Hua Lin (University of Wisconsin) , Matyas Selmeci
      • gratia-probe-1.23.2 bug affecting non-HTCondor sites, preventing pilot record accounting record upload. Any sites with this version installed should update immediately to gratia-probe-1.23.3 and grep for mapped VO Unix names in /var/lib/gratia/data/quarantine/. If any records are found, please contact
      • HTCondor-CE 5.1.1, HTCondor 9.0.1, and XRootD 5.2.0 are available in osg-upcoming-testing
    • 1:20 PM 1:35 PM
      Topical Reports
      Convener: Robert William Gardner Jr (University of Chicago (US))
    • 1:35 PM 1:40 PM
      WBS 2.3.1 Tier1 Center 5m
      Speakers: Doug Benjamin (Brookhaven National Laboratory (US)) , Eric Christian Lancon (Brookhaven National Laboratory (US))

      - successful dCache downtime at 10am ET to improve deletion performance

    • 1:40 PM 2:00 PM
      WBS 2.3.2 Tier2 Centers

      Updates on US Tier-2 centers

      Convener: Fred Luehring (Indiana University (US))
      • Generally OK running (some issues at MWT2 and SWT2):

        • MWT2 IPV6 issue
        • UTA_SWT2 and SWT2_CPB put offline for short periods.
      • Could NET2 and SWT2 report on IPV6 status
      • XRootD 5.2.0 testing underway
      • Pre-scrubbed successfully
      • 1:40 PM
        AGLT2 5m
        Speakers: Philippe Laurens (Michigan State University (US)) , Dr Shawn Mc Kee (University of Michigan (US)) , Prof. Wenjing Wu (University of Michigan)

            Getting ready for downtime and infrastructure update starting 8am Monday 14-Jun-2021

            - Updating the topology in OSG/git to prepare downtime (thanks to Brian, Ofer and Mark)

            - UM will (finish to) replace all the main switches, all cabling (all fiber where possible), and configuration.
              Some servers and worker nodes will  need to be relocated.

            - MSU will be moving all services and dcache storage to the MSU Data Center Monday-Tuesday (Wave 1)
              to coincide with UM downtime.
              Our public and private networks are now extended from our old EX9208 to our 2 new QFX5120 at the DC.
              2 nodes (Wave 0) were moved this Monday to iron out networking issues.
              Some multicast (for ganglia) and stability issues were discovered and fixed.
              The T2 WNs (and the MSU T3) will be moved over time (Wave 2, etc).
              Moving the last set of worker nodes will need to be synchronized with the move
              of the department servers sharing the same cooling (otherwise CRACs would fail on too-cold air return).

            - The UM-MSU link will unfortunately not be switched over to the new State Research Coridor Triangle at this time.
              The MSU multi 100G Research Network will also not be ready for cut-over until at least July.

            - Optimistically we may have dCache back on Wednesday


      • 1:45 PM
        MWT2 5m
        Speakers: David Jordan (University of Chicago (US)) , Jessica Lynn Haney (Univ. Illinois at Urbana Champaign (US)) , Judith Lorraine Stephen (University of Chicago (US))

        UC - loss of IPv6 connectivity to PanDA took site offline last Thursday until Sunday. Monday had loss of IPv6 connectivity from IU/UIUC to UC.

        IU - new head node and perfSONAR servers are racked and ready to be brought online. Squid degradation for an expired k8s certificate on iut2-slate.

        UIUC - working towards adding ICC's HTC resources.


      • 1:50 PM
        NET2 5m
        Speaker: Prof. Saul Youssef (Boston University (US))


        Dealing with an issue right now....

        GPFS getting overloaded => Hammercloud bounced us a couple of times yesterday.   Currently ~30% ddm failures.  Having to reboot one of our gridftp endpoints.   Possibly DAOD physics validation jobs?

        xrd 5.2.0 with clustering and custom containers is working for the GPFS storage.

        Preparing to buy worker nodes.

      • 1:55 PM
        SWT2 5m
        Speakers: Dr Horst Severini (University of Oklahoma (US)) , Mark Sosebee (University of Texas at Arlington (US)) , Patrick Mcguigan (University of Texas at Arlington (US))


        Problem with CE shared directory caused issues, but now working fine

        Seeing some issues with cooling in for SWT2_CPB, working on getting it resolved

        Major purchase submitted to procurement



        Nothing to report, running well.


    • 2:00 PM 2:05 PM
      WBS 2.3.3 HPC Operations 5m
      Speaker: Lincoln Bryant (University of Chicago (US))

      Pilot is failing to create log files at NERSC for a small percentage of jobs. This appears to block stage out for the entire job, I am investigating. Have been in communication with Tadashi regarding the stager. Still not understood why the pilot is failing to create a log file - I will also email Paul if there are issues after updating the pilot to latest version. Have reduced Harvester to a single queued job until I can reliably get jobs to complete again.


      TACC is down for maintenance which is taking much longer than expected. 

    • 2:05 PM 2:20 PM
      WBS 2.3.4 Analysis Facilities
      Convener: Wei Yang (SLAC National Accelerator Laboratory (US))
      • 2:05 PM
        Analysis Facilities - BNL 5m
        Speaker: William Strecker-Kellogg (Brookhaven National Lab)
      • 2:10 PM
        Analysis Facilities - SLAC 5m
        Speaker: Wei Yang (SLAC National Accelerator Laboratory (US))
      • 2:15 PM
        Analysis Facilities - Chicago 5m
        Speakers: David Jordan (University of Chicago (US)) , Ilija Vukotic (University of Chicago (US))

        All running fine.

    • 2:20 PM 2:40 PM
      WBS 2.3.5 Continuous Operations
      Convener: Ofer Rind (Brookhaven National Laboratory)
      • WebDAV and XRootD service added to OSG topology; WebDAV and XRootD service type mappings now added to CRIC as well.
        • A number of questions about recent AGLT2 downtime settings and site configuration have been resolved
        • MWT2 issue encountered trying to shorten downtime
        • Testing with BNL dCache downtime today as well
        • Mark is auditing site configurations
          • Also looking at SRR settings
      • XRootD 5.2 HTTP-TPC testbed updated at BNL and SWT2
        • Status of deployment plan at OU?
      • F-S DevOps meeting (minutes)
        • Recent MWT2 squid downtime/cert issue
        • Moving to normalize SLATE squid configuration going forward
        • Discussion of support structure/processes
        • Squid failover configurations (in general) - future topical presentation?
      • 2:20 PM
        US Cloud Operations Summary: Site Issues, Tickets & ADC Ops News 5m
        Speakers: Mark Sosebee (University of Texas at Arlington (US)) , Xin Zhao (Brookhaven National Laboratory (US))
      • 2:25 PM
        Service Development & Deployment 5m
        Speakers: Ilija Vukotic (University of Chicago (US)) , Robert William Gardner Jr (University of Chicago (US))


        • all updated to 5.2.0, moved to gStream monitoring
        • since Squid wants one dedicated disk, I will be removing one disk from all xcaches and restarting everything
        • SLATE deployment in Beijing should be ready by the end of month. 


        • created everything needed for alarm/alert generation, should be in chart before end of the week

        Alarms & Alerts

        • working fine, updates on Frontier alarm generating code.

        Rucio devs:

        • fixes to how Rucio gets client IP, how it calculates replica ordering
        • work on setting up part of that infrastructure in Cloudflare.


    • 2:40 PM 2:45 PM
      AOB 5m