Brief Cheyenne login and administration nodes outages scheduled

April 28, 2020

The Cheyenne system's login nodes will be unavailable for about an hour beginning at 8 p.m. MDT on Wednesday to allow CISL staff to perform important system updates. Active login sessions and running processes will be killed when those updates begin. Several services will be unavailable, including SSH access to Cheyenne, JupyterHub, and access to Casper via Cheyenne using the execdav or salloc commands. Users will be able to log into Casper directly.

Also, CISL staff will update system software on Cheyenne's administration nodes at noon MDT on Thursday. This is expected to take less than 15 minutes. Several services will be unavailable during the update period including cron, PBS commands (qsub and qstat, for example), and new Cheyenne JupyterHub sessions. Batch jobs and JupyterHub sessions that are already running will not be affected.