Week of 190325

WLCG Operations Call details

  • For remote participation we use the Vidyo system. Instructions can be found here.

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
  • General information about the WLCG Service can be accessed from the Operations Portal
  • 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 wlcg-scod@cernSPAMNOTNOSPAMPLEASE.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

Monday

Attendance:

  • local: Alberto (Monitoring), Borja (Chair/Monitoring), Ivan (ATLAS), Maarten (ALICE), Vincent (Security)
  • remote: David B (IN2P3), Di (TRIUMF), Dave M (FNAL), Jens (NDGF), Marcelo (CNAF), Onno (NLT1), Stephan (CMS), Wojtek (LHCb), Xin (BNL)

Experiments round table:

  • CMS reports ( raw view) -
    • No major grid computing issue(s)
    • Running smoothly at about 230k cores
      • About 50k cores analysis, the rest production

  • ALICE -
    • High activity on average
    • CERN: another 10k "ghost jobs" discovered on Wed (see last week)
      • Disappeared again without leaving a clue
    • Prague: network issues affecting ALICE jobs since late Feb
      • Experts looking into it
    • RRC-KI: NAT issues affected ALICE central services
      • Responsible IP addresses have been blocked for now

Sites / Services round table:

  • ASGC: NC
  • BNL: NTR
  • CNAF: There were some transfers failing from CNAF to QMUL last week (GGUS:140190). After an intervention in the network firewall concerning Jumbo Frames settings in general Internet, this problem vanished. We are now checking the route between CNAF and QMUL to be sure that that was the reason.
  • EGI: NC
  • FNAL: NTR
  • IN2P3: Huge peaks of failing transfers on last Saturday between 7:00 pm and midnight due to some problem updating CRLs. As a result, all transfers were unsuccessful during authentication. The use of dCache is restored since Sunday 1:30 am. The reason is under investigation.
  • JINR: NTR
  • KISTI: NC
  • KIT: Brief downtime (GOC:26930) in order to relocate a CMS dCache pool. Shouldn't take more than 5 minutes until its data is readable again. Writing shouldn't be an issue at any time.
  • NDGF: NTR
  • NL-T1:
    • Network maintenance & redundancy test on Tue April 2. Theoretically transparent; however, there may be some brief interruptions, to/from both SARA-MATRIX and NIKHEF. GOCDB:26903
  • NRC-KI: NC
  • OSG: NC
  • PIC: NC
  • RAL: NC
  • TRIUMF: NTR

  • CERN computing services: NC
  • CERN storage services: NC
  • CERN databases: NC
  • GGUS:
    • A new release is planned for Wed this week
      • Release notes
      • A downtime has been scheduled for 07:00-09:00 UTC
      • Test alarms will be submitted as usual
  • Monitoring:
    • Availability/Reliability final reports for February sent around
  • MW Officer: NC
  • Networks: NTR
  • Security: NTR

AOB:

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Topic revision: r20 - 2019-03-25 - BorjaGarridoBear
 
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