Tape Challenge '22

Alessandra Forti (University of Manchester (GB)), Luca Mascetti (CERN), Maria Arsuaga Rios (CERN), Xin Zhao (Brookhaven National Laboratory (US))
joint tape challenge
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Xin Zhao
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  • Attendees : Antonio Perez-Caleo Yzquierdo, Benedikt Maier, David Mason, Lisa Paspalaki, Andreas Petzold, Christophe Haen, David Cameron, Diego Davila, Douglas Benjamin, Eric Fede, Henryk Giemza, James Walder, Jose Flix Molina, Julia Andreeva, Julien Leduc, Katy Ellis, Luca Mascetti, Mario Lassnig, Mattias Wadenstein, Oliver Keeble, Paul Millar, Riccardo, Shigeki, Xin Zhao

  • Apologies : ALICE (Latchezar, Maarten) 

  • Dates ? 

    • TBD. Needs further discussion and confirmation with VOs, likely to be in March.

  • ALICE plan (based on survey response from ALICE): preferred time is last week of Feb. Same tape write test as done in the last tape challenge

  • ATLAS plan : due to constraints of detector commissioning, DT test is preferred to be in the 3rd week of March, with A-DT test week to be the 2nd or 4th week of March. The same tests as last year tape challenge, but several differences : 1) fake data coming out of TDAQ/SFO, and written to CERN CTA; 2) more realistic RAW data distribution model among T1s. plan under discussion

  • CMS : 1st, 2nd and 3rd weeks in March are fine. In communication with sites. Will use fake data for DT test. srm+https expected be ready by the test. 

  • LHCb :  slides here. mid-March is good start date. A-DT to follow DT test, as the written data will be used in the read test.

  • CERN Tier0 : slides here

    • Publicly visible monitoring plots for CERN transfers ? will provide links. 

  • Tier1s : 

    • NDGF : need to arrange disk buffer to handle higher tape write rate from ATLAS. 

    • Doug : need info about data rate, timeline etc. 

    • PIC: busy with migration to the new IBM tape library, will still use the old library for the tape challenge as did last time. 

    • KIT : new HPSS could be available later in March

    • RAL : new CTA tape system will be ready. 

  • Communication

    • WLCG ops will open GGUS tickets with sites, as did last time, as communication channel between sites and VOs

    • The same egroup and slack channel as we did last time will be used as well

    • A google doc is created for VOs and sites to post their plans, relevant links and other info in it.

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