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Durham University




Welcome to the COSmology MAchine (COSMA)! Here, you will find some information about the COSMA5, COSMA6 and COSMA7 HPC facilities.

Watch the DellEMC COSMA7 video here.

COSMA has been in existence since July 2001 and is now in its 7th generation.

COSMA5 is a Durham system for ICC users and collaborators.

COSMA6 and COSMA7 are the current DiRAC facilities hosted by Durham. COSMA6 was introduced on 1st April 2017 as the DiRAC-2.5 Data Centric service. COSMA7 was introduced as the DiRAC-2.5x system in May 2018, and expanded by DiRAC-2.5y in October 2018.

DiRAC is the UK's integrated supercomputing facility for theoretical modelling and HPC-based research in particle physics, astronomy and cosmology. For more information about DiRAC please visit the DiRAC web pages

The actual load (taken every 15 minutes) on the DiRAC systems can be seen on the SAFE pages:

The COSMA systems run CentOS 7.6, with a 3.10 Linux kernel.

The login details are:
cosma5: or (round-robin to cosma-a and cosma-b)
cosma6: (single node, cosma-i)
cosma7: (round-robin to cosma-m and cosma-n)

All systems use a global slurm batch system. Submission to any queue (cosma, cosma6 and cosma7) can be done from any login node.

COSMA5 is no longer a DiRAC facility. Therefore, DiRAC users should use COSMA6 or 7.

Scheduled downtime

COSMA has 3 periods of scheduled downtime per year, lasting up to a week, though typically the affected period is shorter. Current scheduled periods are:

7-11th October 2019

3-6th February 2020

1-5th June 2020

Contact Details

Institute of Computational Cosmology,
Ogden Centre for Fundamental Physics - West,
Department of Physics,
Durham University,
South Road,
Durham DH1 3LE
COSMA logo


22/7/19: COSMA awarded funding to replace old /cosma5 storage

15/7/19: COSMA4 /gpfs file system powered down for good!

12/7/19: At risk period, 16th July (UPS upgrade)

3/7/19: COSMA login nodes have a fast 10GBit/s link to the outside world

20/6/19: Old data transfer nodes retired from service

7/6/19: New data transfer node with 20GBit/s connectivity added, dataweb, funded by a CO2 reduction scheme

7/6/19: New login node added, login7c

6/6/19: COSMA back in production

3/6/19: COSMA Downtime

Older news here!