From zino at nsc.liu.se Thu Dec 18 07:53:04 2025 From: zino at nsc.liu.se (Peter Bortas) Date: Thu, 18 Dec 2025 07:53:04 +0100 Subject: [Nebula-users] Memory available to jobs decreased Message-ID: Dear Nebula users, The amount of memory available to Slurm jobs has been decreased by 2GiB per node, aka 32KiB per thread. For most (probably all) of you this probably doesn't matter, but jobs that where extremely close to the memory limit already might start failing due to out of memory. Background: This has been done to leave some more space for the operating system to work. Some recent filesystem OS updates requires more RAM to remain stable, and we've had several incidents where jobs running out of RAM has also locked up the node so it has to be rebooted. God Jul, -- Peter Bortas, NSC From zino at nsc.liu.se Thu Dec 18 08:03:59 2025 From: zino at nsc.liu.se (Peter Bortas) Date: Thu, 18 Dec 2025 08:03:59 +0100 Subject: [Nebula-users] Downtime Jan 14 Message-ID: Dear Stratus and Nebula users, On Wednesday the 14h of January we will start a maintenance window for several tasks that require significant downtime of the cluster. The primary cause for this downtime is electrical work which require the power to the computer room to be cut during the work. There will also be work done on the cooling loop providing cold water to the computer room. We are scheduling this maintenance window to start on the 14th at 07:30, lasting to 14:00. We might be able to return the login nodes and some compute nodes to service earlier. However, this should not be expected and depended upon. God Jul, -- Peter Bortas, NSC