HP StorageWorks 8/40 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 294
iSCSI session translation, Brocade iSCSI Gateway or the Brocade Multiprotocol Router.
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12 iSCSI gateway service overview iS CS I i n i ti a to r • Manages iSCSI initiator access control using discovery domains and a discovery domain set • Session management, such as session tracking and performance monitoring • Session authentication using CHAP NOTE The FC4-16IP iSCSI gateway service is not compatible with other iSCSI gateway platforms, including Brocade iSCSI Gateway or the Brocade Multiprotocol Router. iSCSI session translation The iSCSI gateway enables applications on an IP network to use an iSCSI initiator to connect to FC targets. The iSCSI gateway translates iSCSI protocol to Fibre Channel Protocol (FCP), bridging the IP network and FC SAN. The following figure shows a basic implementation. FC target 1 IP network F C 4-16IP iS C S I gateway IP p o r ta l FC p o r ta l SAN L UNs iS C S I virtual target (V T ) iS C S I virtual initiator (V I) IP FC FIGURE 29 iSCSI gateway service basic implementation L UNs FC target 2 The Brocade FC4-16IP blade acts as an iSCSI gateway between FC-attached targets and iSCSI initiators. On the iSCSI initiator, iSCSI is mapped between the SCSI driver and the TCP/IP stack. At the iSCSI gateway port, the incoming iSCSI data is converted to FCP (SCSI on FC) by the iSCSI virtual initiator, and then forwarded to the FC target. This allows low-cost servers to leverage an existing FC infrastructure. To represent all iSCSI initiators and sessions, each iSCSI portal has one iSCSI virtual initiator (VI) to the FC fabric that appears as an N_Port device with a special WWN format. Regardless of the number of iSCSI initiators or iSCSI sessions sharing the portal, Fabric OS uses one iSCSI VI per iSCSI portal. The following figure shows the interaction of different layers from the iSCSI initiator stack to the FC target stack, including the iSCSI gateway service used during protocol translation. 252 Fabric OS Administrator's Guide 53-1001336-01
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