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.

Click here for Arrhenius status information

Ongoing

• Tetralith is being retired. The number of compute nodes is being gradually reduced and will reach 200 (10% of the original size) mid-September. No jobs will be able to run after 2026-09-30 23:59 CEST. No access to the login nodes will be possible after 2026-10-14 23:59 CEST. Data remaining after 2026-10-14 will be deleted. See https://www.nsc.liu.se/support/storage/snic-centrestorage/tetralith-retirement/ for more information.

Future planned maintenance

• None

Recently resolved problems and planned maintenance

• 2026-09-02 from 07:00 CEST: Planned reboot/upgrade of Tetralith login nodes.
• 2026-09-03 from 07:00 CEST: Planned reboot/upgrade of the Sigma login node.
• 2026-07-16 from approx 11:00 CEST to approx 14:20 CEST: Freja unavailable due to a power outage affecting the Linköping University campus. All running jobs failed.
• 2026-07-16 from approx 11:00 CEST to 13:35 CEST: Tetralith and Sigma unavailable due to a power outage affecting the Linköping University campus. All running jobs failed.
• 2026-07-16 from 06:50 CEST: upgrade of Tetralith and Sigma login nodes (short notice due to urgent security update)
• 2026-06-29,30: Unexpected problems with the Arrhenius HPC storage system.
• 2026-06-10 from 13:00 to 14:00: Planned reboot/upgrade of Berzelius Amperes’s login nodes. Running batch jobs are not affected.
• 2026-06-10 from 13:00: Planned reboot/upgrade of Berzelius Hopper’s login nodes. Logged-in users will be logged out, but can login again and continue working on another login node. Running batch jobs are not affected.
• 2026-05-26 from 07:00 CEST: Planned reboot/upgrade of Tetralith login nodes. Logged-in users will be logged out, but can login again and continue working on another login node. Running batch jobs are not affected.
• 2026-05-27 from 07:00 CEST: Planned reboot/upgrade of the Sigma login node. Estimated duration: 30-60 minutes. During this upgrade you cannot access Sigma. Running batch jobs are not affected.
• 2026-04-30 from 08:30 CEST to 10:00 CEST: Fahrenheit login nodes unavailable due to an urgent software update. Estimated duration 1-2 hours.
• 2026-04-30 from 08:30 CEST to 10:00 CEST: Freja login nodes unavailable due to an urgent software update. Estimated duration 1-2 hours.
• 2026-04-30 from 09:00 to 12:30 CEST: Berzelius login nodes unavailable due to an urgent software update.
• 2026-04-30 from 06:00 to 09:00 CEST: Tetralith and Sigma login nodes unavailable due to an urgent software update.
• 2026-04-22 from 10:00 CEST to 17:00 CEST: Planned maintenance Berzelius Ampere and Hopper. See this email for details
• 2026-04-08 from 08:00 CEST: Planned reboot/upgrade of Tetralith login nodes
• 2026-04-10 from 08:00 CEST: Planned reboot/upgrade of the Sigma login node
• 2026-04-06 from 00:40 CEST to 11:30 CEST: partial network outage in Tetralith affecting some jobs

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