Fundamentals of SCSI and iSCSI
Source: Global Knowledge
SCSI (Small Computer Systems Interface), which is present in all personal, defines an initiator/target client/server relationship that includes addresses, commands, and specified operations. The SCSI model has numerous interfaces, including TCP/IP, fibre channel, directly attached parallel bus, and firewire. Fibre Channel and iSCSI are the two major choices for building out SCSI over a network. Both are present in modern data centers.