CISL Daily Bulletin

The Daily Bulletin delivers news about CISL’s high-performance computing environment, training opportunities, scheduled maintenance, and other events of interest to the user community.

Cheyenne restored from weekend power loss
March 20, 2023

The Cheyenne cluster is back online after a regional power incident disrupted operations at the NCAR-Wyoming Supercomputing Center on Saturday, March 18, from approximately 10 a.m to 7:30 p.m. MDT. Cheyenne is operating with one switch offline and one switch in a degraded state as a result of the power disruption. CISL engineers have discovered that certain applications may experience reduced ...

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Derecho weekly update
March 20, 2023

During the week of March 13, the NWSC-3 project team continued resolving a myriad number of hardware and software issues encountered during the initial benchmark runs and NCAR team’s health checks. Later this week, the Spectrum Scale file system will be mounted on Derecho, allowing the consulting team to start building the software stack which will be used during the Acceptance Test Plan (ATP) ...

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System downtimes for week of March 20 - 24
March 17, 2023

Stratus will be down between 7 AM to 7PM Tuesday, March 21 for an upgrade.  No downtime is planned for Cheyenne, Casper, GLADE, Campaign Storage, Quasar, or JupyterHub.  

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Where to run small, CPU-only jobs?
March 16, 2023

CISL recommends running small jobs that use only CPUs on the Casper cluster’s high-throughput computing (HTC) nodes. Casper has 64 HTC nodes specifically for running small batch jobs. It also has: • More shared resources than the Cheyenne share queue. • A far higher concurrent-use limit for CPU cores than Cheyenne: 468 vs. 36. • More available memory, plus NVMe swap for overflow and local stora...

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First ESDS collaborative work session April 17
March 14, 2023

The Earth System Data Science (ESDS) initiative is organizing a series of work sessions in which scientists and software engineers can collaborate on shared analysis workflow problems. These sessions encourage cross-lab collaboration and build lasting science-software partnerships. They are open to NCAR/UCAR staff and others who are interested. The first session – “Working with Unstructured Gri...

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Casper compute nodes, Campaign Storage temporarily unavailable April 11
March 14, 2023

CISL staff will perform maintenance on the Campaign Storage file system from approximately 8 a.m. to 5 p.m. MDT on Tuesday, April 11. During this time, /glade/campaign will be unmounted from Casper and data access nodes and will not be available through Globus. The Casper PBS queues will be halted to prevent batched applications from running until Campaign Storage is accessible again. The Caspe...

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National Science Foundation
This material is based upon work supported by the National Center for Atmospheric Research, a major facility sponsored by National Science Foundation and managed by the University Corporation for Atmospheric Research. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.