System status

Please note: this is a manually updated message.

We will try to update this message when we have major user-visible problems on any of our systems. We also provide information via email to all users of affected systems (via the somesystemname-users@lists.nsc.liu.se mailing lists).

If something is not working, please don’t hesitate to contact us even if this message says that everything is working! Sometimes we forget to update this page when we’re busy investigating a major problem…

Times and dates are in local time (CET/CEST) unless stated otherwise.

Ongoing

• 2026-01-12 from 08:45 CET: unplanned power outage affecting LiU campus and NSC computer rooms. Update 11:48 CET: most systems are now back online

Future planned maintenance

• 2026-01-14 from 07:00 CET to 14:00 CET: Berzelius (Ampere and Hopper) unavailable due to utilities work. See this email for details
• 2026-01-14 from 07:30 CET to 14:00 CET: Nebula unavailable due to utilities work. See this email for details
• 2026-01-14 from 08:00 CET to 14:00 CET: Arcus unavailable due to utilities work. See this email for details

Recently resolved problems and planned maintenance

• 2025-12-18 from 08:00 CET: Software upgrade and reboot of the Sigma login node. Not possible to login to Sigma while this is ongoing. Duration 30-60 minutes.
• 2025-12-17 from 08:00 CET: Software upgrade and reboot of Tetralith login nodes. At least one login available at all times.
• 2025-11-25 from 08:00 CET to 13:15 CEST: Tetralith unavailable due to a planned update of the Slurm job scheduler.
• 2025-11-12 from 08:00 CET: Sigma unavailable due to a planned update of the Slurm job scheduler. See this email for details
• 2025-09-23 from 09:00 CEST to 10:45 CEST: Berzelius unavailable due to system updates. See this email for details

Queue system status

An overview of the overall system load is available on the status page.

Graphical representations of the current queue on some of our systems:

• Tetralith
• Sigma
• Freja