The Daily Bulletin

The CISL User Services Section will present an in-person and online tutorial at 9 a.m. MST Tuesday, December 19, on how to run jobs on the Geyser and Caldera clusters from the Cheyenne HPC system. The Yellowstone system is being decommissioned December 31, but Geyser and Caldera will remain in production throughout 2018.

The 45-minute tutorial will cover submission and monitoring of jobs with the Slurm scheduler, running an interactive job, performing graphically intensive tasks on Geyser, and considerations when using Cheyenne and Geyser/Caldera together in a workflow. The session will include time for questions.

Register to attend in person at NCAR’s Mesa Lab in Boulder or via webcast by selecting a link below:

Attend in person (Chapman Room, ML245, space is limited)

Attend webcast

University users who would like to have their unused Yellowstone allocations transferred to Cheyenne should make their requests well before the end of the year, when the Yellowstone system is decommissioned and the allocations expire on December 31.

The CISL Help Desk will be closed for the holidays on Monday, December 25, and Monday, January 1. Please send your allocation transfer requests to before Christmas to be sure the resources are available on Cheyenne on January 1.

Cheyenne users can now run jobs on the Geyser and Caldera clusters via the Slurm job scheduling system. To learn how, refer to the online documentation and consider attending one of the training sessions that are scheduled for December 4 and 19. See Training: How to access Geyser and Caldera from Cheyenne for more details and how to register.

Approximately half of the Geyser and Caldera nodes are accessible from Cheyenne. The remaining nodes will remain accessible from Yellowstone until the end of this month when Yellowstone will be decommissioned. Shortly after January 1 all of Geyser and Caldera will be available from Cheyenne.

A few slots remain open for the NCL Workshop, February 6-9, 2018, at NCAR’s Center Green Campus in Boulder.

The workshop will include introductory lectures on NCL, scientific data formats, and graphics, and daily hands-on labs.

During the labs, instructors will work with students to help them write NCL programs for analyzing their own data. The registration deadline is January 15.

The Yellowstone supercomputing cluster will be decommissioned on December 31, 2017. The system will be powered down on that date and no longer available to users.

The Geyser and Caldera clusters will remain in production until the end of 2018. Users can learn about how to access those systems from the Cheyenne cluster in training sessions are scheduled for December 4 and 19. See Training: How to access Geyser and Caldera from Cheyenne for more details and how to register.

Users who have not already done so are strongly encouraged to migrate their work to Cheyenne as soon as possible to avoid unnecessary interruptions. Documentation available to help with the transition includes this Quick start overview, procedures and scripts for running jobs, and this recorded tutorial. For help in migrating job scripts or rebuilding executables, please contact

It is not necessary to copy or move files to HPSS or to another disk space to ensure that they are available from Cheyenne after Yellowstone’s decommissioning. All files in the GLADE system file spaces—home, scratch, work, and project—are accessible via Cheyenne already. Copying or archiving files unnecessarily will waste expensive tapes and valuable disk space while increasing use of your allocation.

See our allocations documentation if you do not already have a Cheyenne allocation. University users who want to convert an existing Yellowstone allocation to a Cheyenne allocation should email that request to