Week of 220321

WLCG Operations Call details

• For remote participation we use Zoom: https://cern.zoom.us/j/99591482961
  • The pass code is provided on the wlcg-operations list.
  • You can contact the wlcg-ops-coord-chairpeople list (at cern.ch) if you do not manage to subscribe.

General Information

• The purpose of the meeting is:
  • to report significant operational issues (i.e. issues which can or did degrade experiment or site operations) which are ongoing or were resolved after the previous meeting;
  • to announce or schedule interventions at Tier-1 sites;
  • to inform about recent or upcoming changes in the experiment activities or systems having a visible impact on sites;
  • to provide important news about the middleware;
  • to communicate any other information considered interesting for WLCG operations.
• The meeting should run from 15:00 Geneva time until 15:20, exceptionally to 15:30.
• The SCOD rota for the next few weeks is at ScodRota
• Whenever a particular topic needs to be discussed at the operations meeting requiring information from sites or experiments, it is highly recommended to announce it by email to the wlcg-scod list (at cern.ch) to allow the SCOD to make sure that the relevant parties have the time to collect the required information, or invite the right people at the meeting.

Best practices for scheduled downtimes

• Best practices for scheduled downtimes

Monday

Attendance:

• remote: Kate (DB, chair), Julia (WLCG), Maarten (ALICE, WLCG), Onno (NL-T1), Peter (ATLAS), Borja (monitoring), Andrew (TRIUMF), Concezio (LHCb), Marian (networks, monitoring), Darren (RAL), Christoph (CMS), Xavier (KIT), David B (IN2P3)

Experiments round table:

• ATLAS reports ( raw view) -
  • Tape challenge continue
  • Business as usual, NTR

• CMS reports ( raw view) -
  • CMS started a ticketing campaign for Token transition for HTCondorCEs
  • No other major issues

• ALICE
  • NTR

• LHCb reports ( raw view) -
  • migration to Antares at RAL completed
  • tape challenge ongoing
    • write challenge exceeded requirements almost everywhere
  • no major issues to report
    • incident with lost data at GridKa under evaluation

Sites / Services round table:

• ASGC:
• BNL: Good new/Bad news - Good - new BNL Tape Library used in WLCG data challenge - achieved > 8 GB/s for entire test. Bad - last night (Sunday) 21:21 UTC dCache node with srmmanager, gplazma, spacemanager. rebooted and dCache as put into a broken state for WAN writes (WAN reads were fine). Ultimately all dCache servers on that node needed to be rebooted.
• CNAF:
• EGI:
• FNAL:
• IN2P3: NTR
• JINR: NTR
• KISTI:
• KIT:
  • We again had an incident with our storage on Friday, were a pair of storage switches was ill-configured and tore down the GPFS cluster. Subsequent attempts to restart the services always revealed other problems that had to be taken care of in downtimes. We found that we lost data for ATLAS and LHCb. Full consistency check is still ongoing. A Service Incident Report will be compiled with all the details.

• NDGF:
• NL-T1: NTR
• NRC-KI:
• OSG:
• PIC:
• RAL: NTR
• TRIUMF: Will begin to update our ce's and worker nodes to HTCondor 9.0.11

• CERN computing services:
• CERN storage services:
• CERN databases: NTR
• GGUS: NTR
• Monitoring:
  • Distributed final SiteMon availability/reliability reports for February 2022
  • SAM/ETF ATLAS and CMS now submitting jobs with tokens (with fallback to x509)
• Middleware: NTR
• Networks: On Friday, Canarie announced that they have stopped peering with Kurchatov Institute of Atomic Energy (KIAE) until further notice.
• Security: HTCondor must be updated. Advisory ("heads-up") sent about a critical security vulnerability.

AOB: