Daily Bulletin Archive

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:

November 13, 2018

An NCAR/CISL tutorial scheduled for 9:30 a.m. MST on November 29 will show participants how the Globus command line interface (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. The one-hour tutorial will be at the Foothills Lab (FL2-2001) in Boulder and online.

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

Registration forms will be available in the next few days. Watch for another announcement in the Daily Bulletin.

November 12, 2018

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

November 9, 2018

The frequency and severity of hardware failures on the Geyser and Caldera clusters and the /glade/p_old file system have increased as they approach end of life. These failures pose a risk to users who have not yet moved files that they need from /glade/p_old to one of the new storage spaces or have not begun to migrate their workflows to the new Casper data analysis and visualization cluster.

Several Geyser and Caldera nodes and /glade/p_old disks have already suffered irrecoverable hardware failures. They have been removed and will not be replaced. CISL storage engineers have been able to recover all files from failed /glade/p_old disks and will continue their data recovery efforts until December 15.  After that date, all files on /glade/p_old/ disks that fail will be lost permanently.

As announced previously, the /glade/p_old/ project and work spaces will be decommissioned December 31 and all files will be permanently removed from the system. CISL provides example scripts to help users move their files from old to new GLADE file spaces and documentation for using the new Campaign Storage archive. A tutorial planned for November 29 will demonstrate how to use the Globus CLI to work with Campaign Storage. Watch the Daily Bulletin for more information about the tutorial.

November 7, 2018

User documentation about how to start interactive jobs and batch jobs on NCAR’s new Casper data analysis and visualization cluster now includes additional detail. Starting jobs on Casper nodes has a new section on how to take advantage of the system’s local NVMe solid-state disk (SSD) storage. It also provides more information to help users specify which of the system’s multiple types of nodes to use for running their jobs.

CISL encourages users of the Geyser and Caldera systems, which will be decommissioned at the end of the year, to migrate their work to the Casper cluster soon. In addition to contacting cislhelp@ucar.edu for assistance, users can learn more about the system in a tutorial scheduled for November 14. See this CISL Daily Bulletin announcement to get more information and register.

November 5, 2018

CISL has canceled this month’s full system scheduled downtime due to the increased stability of the Cheyenne, Geyser, Caldera, and GLADE systems and to improve system availability. Next month’s scheduled maintenance downtime has been moved from December 4 to December 11 to accommodate users’ preparations for this year’s AGU conference.

Users can check the HPC Events Calendar any time to see when significant events are scheduled, including maintenance downtimes, software releases, and new hardware installations. NCAR and UCAR users can add it to their own calendars with the “+ Google Calendar” button in the lower right corner of the calendar.

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