Group specific partitions

Some groups and institutes have bought their own extensions of Peregrine and Hábrók. These nodes have been put into special partitions. They share the same storage and software environment as all the other nodes.

Since these nodes have been paid for by the group or institute, their users are often the only ones who can access them. To separate the usage between the group specific nodes and the rest of the cluster a separate account has been made in the scheduler for each of these groups, the other regular account being ‘users’.

Only users which have an account in this group managed account are able to submit to their partition. These people will also have an account in ‘users’, like any other Hábrók user. Jobs submitted in the special partition will be accounted for in these special accounts, and jobs in the other partitions will be accounted for in the regular “users” account.

This sounds a bit complicated, but the main thing to take home is:

• Submit to the dedicated partition to get to the group specific nodes.
  
• Usage (and priorities) of these nodes are handled separately from the usage and priorities of the rest of the cluster.

Users with the coordinator role in one of the special accounts can add users to the account using the following command, which should be run on one of the login/interactive nodes of the cluster:

sacctmgr add user <username> account=<account> fairshare=1

Where <username> should be changed into the userid that is to be added to the account <account>. <account> must be changed into the name of the account, e.g. digitallab, caos. The fairshare should be by default set to 1.

In order to verify/check if a user has already been added to the account, the column “Account” in the output of the following command should show a row with “users” and one with the special account:

sacctmgr show -s user <username>

A full list of users in the account can be obtained using:

sacctmgr show -s account <account>

Note that CIT site administrators can also be members of these special accounts, as they need access for testing node performance and running software installations.

Coordinators can be added to the special accounts using:

sacctmgr add coordinator name=<username> account=<account>

In order to modify an existing user the following can be used:

sacctmgr modify user name=<username> account=<account> set fairshare=10

This will modify the fairshare for the user.

A user can be removed from the account using:

sacctmgr -i delete user <username> account=<account_name>

Until the beginning of January 2026, Hábrók included nodes originally purchased by GEFLIES for the Peregrine cluster. These were 64 core AMD EPYC 7601 nodes, running at 2.2 GHz, with 512GB of memory. Because these nodes came from an earlier purchase, they were older than the existing Hábrók compute nodes and as such, their support has ended. Consequently, they have been decommissioned and the gelifes partition is no longer available.

Please use the regular partition instead.