InfiniBand offers advanced features that are attractive for high performance computing and data center applications that require high performance and no-compromise I/O services in the areas of throughput, latency and end-to-end service level guarantees. Using the protocols discussed in this article, applications that run today over lower performing interconnects can be transparently migrated, without any changes, to work over InfiniBand and avail of the advanced features. The InfiniBand RDMA based software ecosystem is the most advanced one in the industry today, allowing for multiple and reliable software sourcing options.