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Conclusion

You should base your decision to use Ethernet or InfiniBand on performance and cost requirements.

We are committed to supporting both InfiniBand and Ethernet infrastructures. We want to help you

choose the most cost-effective fabric solution for your environment.

InfiniBand is the best choice for HPC clusters requiring scalability from hundreds to thousands of

nodes. While you can apply zero-copy (RDMA) protocols to TCP/IP networks such as Ethernet, RDMA

is a core capability of InfiniBand architecture. Flow control and congestion avoidance are native to

InfiniBand.

InfiniBand also includes support for fat-tree and other mesh topologies that allow simultaneous

connections across multiple links. This lets the InfiniBand fabric scale as you connect more nodes and

links.

Parallel computing applications that involve a high degree of message passing between nodes benefit

significantly from InfiniBand. Data centers worldwide have deployed DDR for years and are quickly

adopting QDR. HP BladeSystem c-Class clusters and similar rack-mounted clusters support IB DDR and

QDR HCAs and switches.

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HP Cluster Platform Cabling Tables Livre blanc Page 11