HP 6125XLG R2306-HP 6125XLG Blade Switch FCoE Configuration Guide - Page 10
VSAN, FC zone
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Figure 4 FC SAN communication model The following takes a server accessing a disk device as an example to see how data communication occurs in an FC SAN. 1. The server and the disk device use the fabric login (FLOGI) protocol to register with the FC switches, which then assign FC addresses to each directly-connected node. 2. The registered server and disk device send name service registration requests to their respective access FC switches to register name service information, including their WWNs and FC addresses. Finally, each FC switch in the fabric stores the name service information for all nodes. 3. To access a disk device, the server needs to send a name service query request to its directly-connected FC switch to obtain the list of disk devices in the fabric and their WWNs and FC addresses. 4. After the server obtains the FC address of the disk device, the server can send FC frames (with the FC address of the disk device as the destination FC address) to the FC switch nearby. 5. When the FC switch receives the FC frame from the server, it queries its FIB table for a data forwarding path according to the destination FC address, and forwards the FC frame to the next-hop FC switch. The next-hop FC switch forwards the FC frame in the same way, until the FC switch at the last hop forwards the FC frame to the destination disk device. NOTE: A FIB table is generated by the FC switch through calculation based on the FC routing protocol or configured static routes. VSAN In actual applications, the data is insecure because the data of all users is transmitted in the same FC SAN. You can divide one physical FC SAN into multiple Virtual Storage Area Networks (VSANs). In this manner, VSANs are separated from one another and provide independent services, enhancing adaptability and security of the network and offering more effective services for users. For more information about VSAN, see "Configuring VSAN." FC zone With VSAN, one physical SAN is divided into multiple logical SANs. A VSAN, however, cannot perform access control over the servers and disk devices (or the N_Ports) connected to a fabric. N_Ports in the same VSAN can access one another only if these N_Ports register name services. This creates data security risks. 4