470 IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Figure 11-9 Storage Network Protocol Layering
11.4.2 Converged Network Adapters
In a traditional FC storage area network (SAN) and LAN environment, the server has an
Ethernet adapter for data traffic and a Fibre Channel host bus adapter (HBA) for storage
traffic. With converged networks that might include FCoE, these two adapters are replaced by
a converged network adapter (CNA) that services both protocol stacks. A cable from the CNA
connects to a lossless Ethernet switch, which eventually provides connectivity to an FCF and
storage devices. Figure 11-10 illustrates a CNA in an IBM Flex System Enterprise Chassis
compute node server. In the compute node the only CNA adapter available is the IBM Flex
System CN4054 10Gb Virtual Fabric Adapter.
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