CISL engineers are planning updates to the JupyterHub on January 9th that will temporarily take the service offline. During this outage, we will migrate the JupyterHub to newer hardware, and remove the Cheyenne server types from the interface (note that Cheyenne batch servers will no longer be available after December 31st as PBS queues will be stopped at that time). Shortly thereafter, we will add a Derecho batch option to the production JupyterHub to enable access to Derecho queues, though we expect most JupyterHub work will continue to happen on Casper.

If you have custom language kernels or personal lab extensions, these will still be available after the outage. However, to facilitate the migration to the new hardware and improve the reliability of the service, we will be clearing the Hub database of all existing users and servers. When you sign back in after the outage, you will start with no running servers and any “named” servers will need to be recreated as needed; make sure you save all active Jupyter work before the morning of the 9th.

Please reach out to Research Computing support staff via a support ticket if you have any questions.