HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, December 2009)

Fabric OS 6.1.x administrator guide 253
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iSCSI Gateway services
Overview of iSCSI gateway service
The FC4-16IP iSCSI gateway service is an intermediate device in the network, allowing iSCSI initiators in
an IP SAN to access and utilize storage in a Fibre Channel (FC) SAN as shown in Figure 17.
Figure 17 iSCSI gateway network
It provides the following services to the iSCSI initiators:
• Access to the fabric using virtual FC devices (iSCSI virtual initiator)
• Supports target registration to an iSCSI Name Server (iSNS) for discovery
• 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 iSCSI Gateway or the MP 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. Figure 18 shows a basic implementation.
Figure 18 iSCSI gateway service basic implementation
The 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.
FC target 1
FC target 2
iS CS I
initiator
SAN
LUNs
LUNs
FC4-16IP
iS CS I gateway
IP
network
iS CS I
initiator
iS CS I virtual
initiator (VI)
iS CS I virtual
target (VT )
SAN
IP
network
IP
portal
FC
portal
FC4-16IP iS CS I gateway
FC
IP
FC
target 1
FC
target 2
LUNs
LUNs