Week of 240318

WLCG Operations Call details

• The connection details for remote participation are provided on this agenda page.

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:

• local: Maarten (Alice WLCG),
• remote: Andrew (TRIUMF), Brian (RAL), Concezio (LHCb), Darren (RAL), David B (IN2P3), Julia (WLCG), Matteo (CNAF), Onno (NL-T1), Panos (WLCG, Chair), Priscilla (ATLAS), Ville (NDGF), Xavier (KIT)

Experiments round table:

• ATLAS reports ( raw view) -
  • ATLAS T1 post-DC24 exercise continuing
    • repeating the T0 Export tests (i.e. only traffic from T0 -> T1s). The plan (with some changes respect to the tentative this morning) is to run for 6 hours per Tier-1 to achieve the isolated DC24 target rates for the T1s: Mon, 18th: RAL, Tue, 19th: pic , Wed, 20th: Triumf, Thu, 21st: All T1s together
    • Further details in GGUS, e.g. GGUS:165525
  • meta-rpm dependency issue
    • apologies for gfal openldap-compat confusion. Can be removed from HEP meta-rpm, at your leisure.
    • Details: current ALRB gfal2 is compiled with wrong `openldap-compat` dependencies ( DMC-1404), already fixed in EMI testing 24.03.14-snapshot-x86_64-el9 (`export ALRB_emiVersion=testing`)
  • For information: we will push in the next days the remeaining storages that did not update dCache tokens
  • For discussion: the GRIF RSE model: - RSE spread through 3 sites. How can we be less sensitive to the DT of one of the sub-sites? WARNING might not be sufficient, better OUTAGE since 1/3 of the files are unavailable?
    • GGUS:165523
    • Maarten will contact GRIF. Since the storage is now unified between the different GRIF sites when one part of it is unavailable a downtime should be created for the whole site.

• CMS reports ( raw view) -

• ALICE
  • NTR

• LHCb reports ( raw view) -
  • smooth running, no major issues
  • some impact on operations due to the GRIF partial storage unavailability (GGUS:165535)
  • setting up data challenge with Beijing (proto-) Tier1
  • repeating data challenge with CNAF; writing test last week, reading test this week

Sites / Services round table:

• BNL: NTR
• CNAF: NTR
• EGI:
• FNAL:
• IN2P3: NTR
• JINR:
• KISTI:
• KIT: NTR
• NCBJ:
• NDGF: NTR
• NL-T1: On the 13th, one of our two tape libraries was down. Part of the tape data was not available. GOCDB:35118 and GOCDB:35121
• NRC-KI:
• OSG:
• PIC: SD on 26/03 from 3h30 am to 23h. It has been published in GOCDB. We have the yearly maintenance on PIC building.
• RAL: NTR
• TRIUMF: NTR

• CERN computing services:
• CERN storage services:
• CERN databases:
• GGUS: NTR
• Monitoring:
  • Distributed final SiteMon availability/reliability reports for 2024 02
• Middleware: NTR
• Networks:
• Security:

AOB:

• Ville reported that GGUS feels slow today (~20seconds to access a ticket). A ticket will be created to the GGUS team so that they can investigate this report