Gamma has been replaced with a new system named Sigma. Awarded Gamma allocations has been transferred to Sigma and users migrated.
Sigma has a capacity that exceeds the current computing capacity of Gamma and has been available since August 23. Gamma was shut down on September 21. Existing centre storage is connected to Gamma.
Gamma is equipped with fast interconnect network (Mellanox Infiniband FDR). It has a combined peak performance of 61 Teraflops/sec, 3,840 compute cores, 9 Terabytes of memory, and 11 Terabit/s aggregated network performance.
The system is based on HP's Cluster platform 3000 with SL230s Gen8 compute nodes, and was delivered in 2012 by GoVirtual AB.
It has 228 thin nodes with 16 cores and 32 GiB memory, 10 fat nodes with 16 cores and 128 GiB memory, and 2 huge nodes with 16 cores and 256 GiB memory.
Gamma have been replaced with a new system, Sigma, that was made available to users on August 23, 2018. NSC currently plan to keep Gamma in operation and available to users until September 21st, 2018. After that, Gamma will be permanently shut down and decommissioned.
Heffa
NSC
14
—
58
x 1000 core-h/month
Heffa is an experimental lab resource for running big data analytics using the Hadoop software stack.
Heffa is an experimental lab resource for running big data analytics using the Hadoop software stack. It is presently available for limited allocations primarily for evaluation and educational use. Allocation periods and amount of resources will be handled on case-by-case basis. We invite users to give feedback from their experiences.
Sigma, sigma.nsc.liu.se, runs a Rocky Linux 9 version of the NSC Cluster Software Environment. This means that most things are very familiar to Gamma users.
You still use Slurm (e.g sbatch, interactive, ...) to submit your jobs. ThinLinc is available on the login node. Applications will still be selected using "module".
All Sigma compute nodes have 32 CPU cores. There is 104 "thin" nodes with 96 GiB of primary memory (RAM) and 4 "fat" nodes with 384 GiB. Each compute node have a local SSD disk where applications can store temporary files (approximately 200GB per node).
All Sigma nodes are interconnected with a 100 Gbps Intel Omni-Path network which is also used to connect the existing storage. The Omni-Path network work in a similar way to the FDR Infiniband network in Gamma (e.g still a fat-tree topology).
Sigma have a capacity that exceeds the current computing capacity of Gamma. Sigma was made available to users on August 23, 2018.
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