Kappa was decommissioned on June 12th, 2015 and replaced by the Gamma cluster.


Kappa is a Linux-based cluster with 366 compute nodes and a combined peak performance of 27 TFLOPS.

Each compute node (HP DL170h) is equipped with two quad-core processors of type Intel® Xeon® E5520 and 24 or 72 GB RAM.

Each of the two "huge" nodes (HP DL980) has 1024 GB RAM and eight processors of CPU type Intel® Xeon® E7-2800 which have eight cores each, giving 64 cores in total.

System Details

Hardware HP Cluster Platform with DL170h G6 compute nodes
Processors 4-core Intel Xeon E5520 processors at 2.2GHz
Number of compute nodes 366
Compute node (thin) 2 sockets (8 cores) with 24 GB memory (192 nodes)
Compute node (fat) 2 sockets (8 cores) with 72 GB memory (72 nodes)
Compute node (huge) 8 sockets (64 cores) with 1024 GB memory (2 nodes)
Login nodes One HP ProLiant DL180 G6 server, accessible using SSH
High speed interconnect Infiniband QDR high-speed interconnect
Node scratch storage 90 TB (250 GB per node)
Global file system Kappa uses NSC's Centre Storage system
Operating system CentOS Linux 5
Batch queue system Slurm

Computing services provided by Kappa

  • Running traditional HPC batch jobs, submitted from the login node ("head node")
  • Interactive use of compute nodes (for e.g test, development or to run graphical applications)
  • HPC jobs with custom ("green-style") job scheduling (guaranteed node access and risk jobs, for selected projects only)

Research performed with Kappa

Kappa is open for users within Linköping University.


  • 2009 - Kappa was installed as a shared SNIC/LiU system
  • 2012 - SNIC funding for Kappa ended, Kappa was kept operating as a LiU-only system.
  • June 12th, 2015 - Kappa retired and replaced by the Gamma system

Who can use Kappa?

Access to Kappa is granted by NSC. Local researchers at Linköping university can apply for computing time on Kappa. See applying for a new project for details.

User Area

User support

Guides, documentation and FAQ.

Getting access

Applying for projects and login accounts.

System status

Everything OK!

No reported problems


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