A SAN switch is often a Fibre Channel (FC) switch, which is compatible with the Fibre Channel protocol. The FC switch checks the data packet header, determines the computing devices of origin and destination, and sends the packet to the intended storage system. An FC switch is designed for use in a high-performance network with low latency and lossless data transmission.
A SAN switch can also be an Ethernet switch. The Ethernet-based SAN switch would ideally be devoted to storage traffic in an Internet Protocol (IP) SAN to try to maintain performance predictability. The Ethernet switch would view the iSCSI storage target as an IP address and forward the storage traffic to the IP address.
Read about the fundamentals of storage area network systems to see how they compare to other storage architectures, like DAS or NAS.
Purchasing a SAN system? Use this expert advice to determine which criteria to include in your vendor RFP.