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In order to meet the demands of the storage system, enterprises apply SAN to increase the system efficiency and capacity expansion. According to SNIA (Storage Networking Industry Association), SAN is:

1. The purpose of the SAN is transmitting data between storage systems and storage systems or storage systems and client servers. The SAN fabric contains physical connections from storage systems to client, and then storage management devices, servers, and network devices. However, SAN is usually defined as block I/O services provider.

2. The storage system contains storage components, devices, computer equipments, software applications, and network devices.