System Description

The system consists of 34 compute nodes, a frontend node for accessing the system, and an IBM Elastic Storage system.

Summary

• Compute nodes: 34

• CPU cores: 4352

• Memory: 58 TiB

• Storage: 1 PiB

• Interconnect: 100 Gbps InfiniBand EDR

Compute nodes

4x Lenovo ThinkSystem SR645 (called hm1 in Slurm)

• 4096 GB DDR4-2400 LRDIMM

• 2x AMD EPYC 7742 64-Core @ 2.25Ghz

• 480 GB SSD

• 7.68 TB NVMe (only two nodes)

10x Dell PowerEdge R6525 (called hm2 in Slurm)

• 1024 GB DDR4-2933

• 2x AMD EPYC 7713 64-Core @ 2.0Ghz

• 480 GB SSD

20x Lenovo ThinkSystem SR645 V3 (called hm3 in Slurm)

• 1536 GB DDR5-4800

• 2x AMD EPYC 9534 64-Core @ 2.45Ghz

• 480 GB SSD

Frontend

Lenovo ThinkSystem SR645

• 128 GB DDR4-2933

• 2x AMD EPYC 7282 16-Core @ 2.8Ghz

• 480 GB SSD

Network

The InfiniBand network is configured as a fat tree, with the compute nodes being connected to two different leaf switches. The hm1 and hm2 nodes are connected to the first leaf switch and the hm3 nodes are connected to the second one. The connection between the two leaf switches is oversubscribed, which means that jobs requiring high network throughput should be restricted to nodes on the same switch. Slurm will automatically try to select nodes on the same switch, but it will not force it.