IP SAN and FC SAN are different types of storage area networks (SANs) that use different protocols for data transmission.
IP SAN uses the iSCSI protocol for data transmission. It is a block-level protocol that allows data to be transferred over IP networks and it allows to connect hosts and storage systems over long distances using standard Ethernet networks.
FC SAN uses the Fibre Channel (FC) protocol for data transmission. It is a dedicated protocol that uses a dedicated cabling and a specialized switch infrastructure to connect hosts and storage systems.
Both IP SAN and FC SAN encapsulate the SCSI command with their underlying protocol before transmission, but they cannot connect to each other without additional protocols such as Fibre Channel over IP (FCIP) or Internet SCSI (iSCSI) which are used to tunnel Fibre Channel or iSCSI over an IP network.
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