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NUG Meeting Oct 15, 2020

October 15, 2020
Date: Thursday, October 15, 2020
Time: 11:00 PST


Update: Slides are attached below, and video is now online at

The Monthly NUG Meeting is a regular opportunity for our users to show off what they've done, for NERSC to get feedback from users, and for users to exchange ideas.

Zoom: (full connection details below). We'll also use the NERSC Users Slack #webinars channel for discussion before, during and after the meeting.
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For a more detailed agenda please see this document.

  • Win-of-the-month: open discussion for attendees to tell of some success you've had - eg getting a paper accepted, solving a problem, or achieving something innovative or high impact using NERSC
  • Today-I-learned: open discussion for attendees to point out something that surprised them, or that might be valuable to other users to know
  • Announcements and CFPs: upcoming conferences, workshops, or other events
  • Topic-of-the-day: Today's topic is "The cscratch1 crash". Cori had a major outage during the last two weeks. We're still investigating the root cause but the trigger conditions appear to relate to files with a very large stripe count. We'll give an overview of the crash, the conditions that we think triggered it and the impacts users might be seeing. We'll also have some Q&A with NERSC's Doug Jacobsen (Computational Systems Group), Glenn Lockwood (Storage Systems Group) and Lisa Gerhardt and Alberto Chiusole (Data and Analytics Services).

    We're still investigating the root cause, so a deeper analysis will be a topic for a future meeting. But we can discuss what we know so far, tips for working around impacts you experience as a result, and how we debug this kind of issue.
  • Coming up: Nominations and requests for future topics
  • Last month's numbers: NERSC center metrics and info for the most recent month

Connection Info

Join from PC, Mac, Linux, iOS or Android:

Or iPhone one-tap :
US: +16699006833,,285479463# or +16465588656,,285479463#
Or Telephone:
Dial(for higher quality, dial a number based on your current location):
US: +1 669 900 6833 or +1 646 558 8656 or +1 877 369 0926 (Toll Free) or +1 855 880 1246 (Toll Free)
Meeting ID: 285 479 463
International numbers available:

Or an H.323/SIP room system:
H.323: (US West) (US East) (China) (India) (EMEA) (Australia) (Hong Kong) (Brazil) (Canada)
Meeting ID: 285 479 463

SIP: [email protected]