A SAN is generally perceived as a series of three distinct layers: a host layer, a fabric layer and a storage layer. Each layer has its own components and characteristics
better performance, and redundancy. SAN directors are used in larger SAN networks.
The hierarchy of SAN network implementation consists of three layers:
• The host layer is the layer where servers can use the storage devices in the SAN. Servers connect to the SAN network using host bus adapters (HBAs). Server HBAs are cards installed on the server motherboard that connect to SAN through Fibre Channel, Fibre Channel over Ethernet, or iSCSI.
• The fabric layer is the network layer for SAN. Fabric layer interconnects hosts, routers, SAN switches, and storage devices. The SAN fabric provides bandwidth, performance, scalability, and redundancy for local SANs and remote SANs.
• The storage layer consists of various storage devices that create a shared pool of storage for servers. The storage layer interfaces with the fabric layer and host layer through SAN protocols and presents each storage resource to the servers as a uniquely identifiable entity with a logical unit number (LUN).
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