Daily Bulletin Archive

December 3, 2018

No downtime: Cheyenne, GLADE, Geyser_Caldera, HPSS and Casper

November 30, 2018

Users should migrate their data analysis and visualization (DAV) workflows to the new Casper cluster soon if they have not already done so. The Geyser and Caldera clusters will be decommissioned on December 31 and are experiencing more frequent hardware failures as they approach end of life. Several Geyser and Caldera nodes have already suffered irrecoverable hardware failures. They have been removed and will not be replaced.

During a scheduled maintenance downtime on December 11, the execdav command will be updated so it defaults to assigning Casper nodes for use in interactive jobs. When Geyser and Casper are decommissioned, the execgy and execca commands will be removed. Keep an eye out for more information about the December 11 downtime in upcoming Daily Bulletins.

Related support for using Casper:

November 30, 2018

Users of CRYPTOCard keypads who have not converted to a supported authentication method will not be able to log in with those tokens as of December 3, 2018. As announced earlier in the Daily Bulletin and in emails to users, there are two alternatives:

Contact cislhelp@ucar.edu for assistance.

November 28, 2018

Cheyenne system administrators will perform preventive maintenance on the PBS workload management system at 12:00 noon MST today, November 28. The maintenance is expected to take less than 30 minutes to complete.

Most PBS commands will not work during that time, including qstat, and new Cheyenne job submissions will not be possible. Jobs that are executing when the maintenance begins will continue to run without interruption. Jobs that are queued for execution or in a hold state will remain in those states until PBS is returned to service. Access to Cheyenne’s login nodes will not be interrupted.

November 27, 2018

No downtime: Cheyenne, GLADE, Geyser_Caldera

November 26, 2018

CISL has published new recommendations for optimizing the performance of the Weather Research and Forecasting (WRF) modeling system. The recommendations are based on the results of numerous jobs that were run on the Cheyenne system by the CISL Consulting Services Group. The jobs included small runs and others with a variety of domain sizes and time steps. See Optimizing WRF performance for details.


November 21, 2018

A recording and slides of the November 14 NCAR/CISL tutorial on using the new Casper system are now available on the CISL web site. See the course page to review the presentation and download the slides. The presentation introduces the capabilities of the new Casper system, describes how to access its features, and provides some best practices.

Topics covered include:

  • The four types of Casper nodes and their features

  • Accessing Casper resources using Slurm

  • Interactive jobs and remote virtual desktops (VNC)

  • Using the GPU capabilities of Casper

Also see: Casper documentation home page.

November 20, 2018

NCAR will no longer support use of CRYPTOCard two-factor authentication keypads as of December 3, 2018. Anyone who still uses one to authenticate to UCAR/NCAR systems must request one of two alternatives soon to allow time for delivery and setup:

Email your request to cislhelp@ucar.edu well before December 3 to avoid being unable to log in to systems that require authentication.

November 19, 2018

No downtime: Cheyenne, GLADE, Geyser_Caldera, HPSS and Casper

November 14, 2018

Registration is now open for an NCAR/CISL tutorial on using the Globus command line interface (CLI) at 9:30 a.m. MST on November 29. The one-hour tutorial will show participants how the Globus CLI can be used both interactively and within scripts as part of larger workflows. Much like the HSI interface to tape, the Globus CLI enables programmatic access to NCAR and external data endpoints, including the new NCAR Campaign Storage archive.

Topics will include:

  • Initiating, monitoring, and modifying transfers between endpoints

  • Incorporating CLI commands into data mover scripts

  • Best practices for storing data at NCAR

  • Strategies for archiving research data on the new Campaign Storage platform

Register to attend in person – in the Small Seminar Room (FL2-1001) at NCAR’s Foothills Lab in Boulder – or attend online by selecting one of these links: