The Flex System CN4058S 8-port 10Gb Virtual Fabric Adapter and CN4052 2-port 10Gb Virtual Fabric Adapter are part of the VFA5 family of System x and Flex System adapters. These adapter supports up to four virtual NIC (vNIC) devices per port (for a total of 32 for the CN4058S and 8 for the CN4052), where each physical 10 GbE port can be divided into four virtual ports with flexible bandwidth allocation. These adapters also feature RDMA over Converged Ethernet (RoCE) capability, and support iSCSI, and FCoE protocols with the addition of a Features on Demand (FoD) license upgrade.

With hardware protocol offloads for TCP/IP and FCoE, the CN4058S and CN4052 provides maximum bandwidth with minimum use of CPU resources and enables more VMs per server, which provides greater cost saving to optimize return on investment. With up to eight ports, the CN4058S in particular makes full use of the capabilities of all supported Ethernet switches in the Flex System portfolio.