iSCSI is Internet SCSI (Small Computer System Interface), an Internet Protocol (IP)-based storage networking standard for linking data storage facilities, developed by the Internet Engineering Task Force (IETF). By carrying SCSI
commands over IP networks, iSCSI is used to facilitate data transfers
over intranets and to manage storage over long distances. The iSCSI protocol is among the key technologies expected to help bring about rapid development of the storage area network (SAN)
market, by increasing the capabilities and performance of storage data
transmission. Because of the ubiquity of IP networks, iSCSI can be used
to transmit data over local area networks (LANs), wide area networks (WANs), or the Internet and can enable location-independent data storage and retrieval.
This is really has brought a revolution in linux too with open source tools like openfiler.
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