Unified system - Transition guide

During the May 2024 downtime and maintenance, we setup new SLURM controllers. Some changes affect SCC users especially.

Partitions

The default partition is now standard96. This is an NHR partition. In fact, all the NHR partitions are visible on the SCC and vice versa. It is important for all SCC users to not simply try to run jobs on the default partition. Your jobs will remain in the queue indefinitely with status PartitionConfig. You need to explicitly specify the partition -p medium (which was the default on the SCC previously).

Also, you can only submit to the NHR partitions using the NHR front end nodes glogin.hpc.gwdg.de, and to the SCC systems using the SCC front end nodes login-mdc.hpc.gwdg.de.

It is not possible to submit jobs to the NHR partitions from the SCC (or as an SCC user logged into the NHR frontend nodes) and vice versa.

SCC Slurm Account Names

Most SCC users have only a single Slurm account associated with their username which is usually the default account (you don’t have to use -A ACCOUNT to use the default account). It’s name has been changed from all to scc_users. The renamed Slurm accounts for SCC users are listed in the table below.

To see all Slurm accounts you have access to, run the following from a login node.

sacctmgr show assoc user=$USER

QoS

The QoS system has changes mainly for SCC in terms of names, but also some changes effect the NHR names.

Selecting GPUs

Only the names change slightly, because they now require to use upper case letters.