It is important that all users start testing and migrating now from the SUSE Linux Enterprise Server (SLES 12 and 15) operating system environment to the Red Hat Enterprise Linux-based Tri-Lab Operating System Stack (TOSS 3) to ensure your applications will continue to run by mid-November, when the TOSS 3 environment will be in full production on most of the PFEs and Pleiades, Electra, and Aitken compute nodes.

As announced in recent notifications from NAS Operations, this major transition of the operating system is in progress, and in mid-November the majority of the PFEs and compute nodes will use the TOSS3 operating system by default, leaving very few nodes available to run under the SLES 12 and SLES 15 environments.

In late December, SLES 12 and SLES 15 will be turned off.

For information on how to get started, see the following HECC Knowledge Base article:

Testing Period for TOSS Operating System Migration

We encourage your feedback during the testing period.

If you have any questions or need help, please contact the Control Room at (800) 331‑8737, (650) 604‑4444, or support@nas.nasa.gov.