SAN (storage area network) storage design method based on optical fiber link

The invention provides an SAN (storage area network) storage design method based on an optical fiber link. Multipath redundancy I/O (Multipath input/output) means that a server is connected to a block storage device through a plurality of physical paths, when one physical path is faulted due to failure of an HBA (host bus adapter) card, a cable, an interchanger or an RAID (redundant array of independent disk) controller of a storage device and the like, I/O through the physical path can be transferred onto the other normal physical paths by the server, and an application program cannot detect the change, so that usability of a system is improved. I/O loads can be balanced, system performance is improved, and the multipath redundancy I/O mainly refers to a fault-tolerant mechanism.