Cheyenne maintenance update

February 27, 2020

All work that was scheduled for Wednesday at the NCAR-Wyoming Supercomputing Center (NWSC) was completed successfully and without incident. HPE engineers completed repairs on all 56 targeted InfiniBand fabric switches, Nortek engineers finished their final inspections of the Cheyenne system’s cooling units, and CISL facility engineers completed their repair and maintenance on the NWSC mechanical and electrical infrastructure. CISL HPC engineers updated the system’s Linux kernel and the InfiniBand network’s operating system and firmware.

While Cheyenne remains down, users can access the Casper cluster, the GLADE and Campaign Storage file systems, data-access nodes, and HPSS by logging directly in to Casper at

Cheyenne is expected to be returned to service no later than Saturday evening. Watch for regular updates in CISL’s Daily Bulletin and Notifier service.