Yggdrasil scheduled maintenance: 25-28 November 2025

Dear users,

as just announced on the baobab-announce@ mailing list, we will be performing software and hardware maintenance on the Yggdrasil HPC cluster from 25 to 28 November 2025, starting at 08:00 +0100.

You’ll receive an email when the maintenance is finished. The cluster will be completely unavailable during this time, with no access whatsoever (not even to retrieve files).

We remember you that you our two other HPC clusters are available during the maintenance!

When submitting a job, make sure that the expected wall time (duration) doesn’t overlap with the start of the maintenance, or it will be scheduled after.

What will be done during this maintenance

  1. All compute nodes will be reinstalled with latest version of Rocky 9

  2. Upgrade Slurm to version 25.05.4.

  3. Update all servers to the latest security and bugfix releases.

During the maintenance period we are very busy and provide limited user support.

Thank you for your understanding.
Best regards, The HPC Team