A SAN (Storage Area Network) is a network specifically dedicated to the task of transporting data for storage and retrieval. SAN architectures are alternatives to storing data on disks directly attached to servers or storing data on Network Attached Storage (NAS) devices which are connected through general purpose networks.
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:
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.
The storage system contains storage components, devices, computer equipments, software applications, and network devices.
SAN is able to attach with various kinds of storage devices, such as disk-array subsystems, CD towers, magnetic tape drivers and libraries, and provides data I/O services via hub or switches through network connections.
SAN (Storage Area Network) Protocols
Storage Area Networks are traditionally connected over Fibre Channel networks. Storage Area Networks have also been built using SCSI (Small Computer System Interface)technology. An Ethernet network which was dedicated solely to storage purposes would also quality as a SAN.
Internet Small Computer Systems Interface (iSCSI) is a SCSI variant which encapsulates SCSI data in TCP packets and transits them over IP networks.
Fibre Channel over TCP/IP (FCIP) tunnels Fibre Channel over IP-based networks.
The Internet Fibre Channel Protocol (iFCP) transports Fibre Channel Layer 4 FCP on IP networks.
Advantages of SAN
By integrating storage devices, SAN increases the storage space usability and cost efficiency.
SAN is the high-speed storage sharing system.
SAN increases the network bandwidth and reliability of data I/O.
SAN is separated from the regular network system, and has an ability to expand the storage capacity.
SAN reduces the cost of the storage management since it simplifies the system fabric and devices management.
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