The Cisco InfiniBand Host Channel Adapters (HCAs) offer high-performance connectivity to InfiniBand-based server clusters. As an integral part of the Cisco SFS Family of server fabric switches, the Cisco InfiniBand HCAs support Message Passing Interface (MPI), IP over InfiniBand (IPoIB), and Sockets Direct Protocol (SDP), which use InfiniBand Remote Direct Memory Access (RDMA) to support the most demanding high-performance computing applications and high-performance database clusters. You have the option of using the Cisco host driver stack or a commercial version of the OpenIB Gen2 stack. OpenIB is the open-source community development of InfiniBand drivers.