HP A7533A HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, Dece - Page 253

13 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. iS CS I i n i ti a to r FC 4-16IP iS C S I gateway F C target 1 IP network SAN L UNs Figure 17 iSCSI gateway network L UNs F C target 2 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. iS CS I i n i ti a to r IP network F C 4-16IP iS C S I gateway IP p o r ta l FC p o r ta l FC target 1 SAN L UNs iS C S I virtual target (V T ) IP iS C S I virtual initiator (V I) FC L UNs FC target 2 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. Fabric OS 6.1.x administrator guide 253