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The three supercomputing clusters Cirrus, Stratus, and Nebula were installed in the end of 2018 to support the official duties of SMHI in Sweden, MET in Norway, and FMI in Finland within MetCoOp (the meteorological co-operation on operational numerical weather prediction in the Nordic countries).
Cirrus and Stratus deliver more than double the computational performance of the previous Frost and Alvin clusters at NSC, while using only about 25% more power. The main purpose of Cirrus and Stratus is to provide computing power for operational numerical weather prediction, while the Nebula cluster is used for research and development, primarily for MET Norway. Together with the Teho and Voima systems at FMI in Finland, these clusters form the HPC infrastructure for operational weather forecasting for MetCoOp.
All of the clusters are operated by NSC, but the Cirrus cluster is located at SMHI in Norrköping for improved redundancy. Stratus and Nebula are located in Linköping at NSC.
The cluster was delivered and installed by Clustervision BV, using mostly Intel components (servers, CPUs network, and SSDs).
| Location | NSC in Linköping |
| Compute nodes | 520 (508 thin, 12 fat) |
| Total number of cores | 16,640 |
| Estimated max. power | ca 213 kW |
| Fast network | Intel OmniPath 100 Gbit/s with 48-port leaf and spine switches |
| Global storage | IBM Spectrum Scale GPFS-based storage appliance (ca 2.0 PB) |
The Stratus login node is called:
stratus.nsc.liu.se
Please see the general instructions on getting started for information on how to login for the first time and set your permanent password. Further information available in the Stratus getting started guide.
The compute nodes of Cirrus, Stratus and Nebula are equipped with:
| Server model | Intel HNS2600BPB with Intel H2204XXLRE 2U/4-node chassis |
| CPU:s | 2x Intel Xeon Gold model 6130 at 2.1 GHz (16 cores each) |
| L2/L3 cache | 1 MiB/core L2 cache, 44 MiB per socket L3 cache |
| Memory (thin) | 96 GiB DDR4 2666 Mhz dual rank memory |
| Memory (fat) | 384 GiB DDR4 2666 Mhz dual rank memory |
| Disk (thin) | 240 GiB SSD (Intel DC S4500) |
| Diskt (fat) | 960 GiB SSD (Intel DC S4500) |
Access to Stratus is granted by SMHI or by MET Norway.
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National Supercomputer Centre
Linköping University
581 83 LINKÖPING
SWEDEN
Org.nr: 202100-3096
VAT.nr: SE202100309601
