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50-3
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 50 Configuring iSCSI
About iSCSI
For the Fibre Channel SAN view, the IPS module or MPS-14/2 module presents iSCSI hosts as a virtual
Fibre Channel host. The storage devices communicate with the virtual Fibre Channel host similar to
communications performed with real Fibre Channel hosts (see
Figure 50-3).
Figure 50-3 Fibre Channel SAN View—iSCSHI Host as an HBA
The IPS modules or MPS-14/2 modules transparently map the command between the iSCSI virtual target
and the virtual Fibre Channel host (see
Figure 50-4).
Figure 50-4 iSCSI to FCP (Fibre Channel) Routing
Routing SCSI from the IP host to the Fibre Channel storage device consists of the following main
actions:
• The iSCSI requests and responses are transported over an IP network between the hosts and the IPS
module or MPS-14/2 module.
• The SCSI requests and responses are routed between the hosts on an IP network and the Fibre
Channel storage device (converting iSCSI to FCP and vice versa). The IPS module or MPS-14/2
module performs this conversion and routing.
• The FCP requests or responses are transported between the IPS module or MPS-14/2 module and
the Fibre Channel storage devices.
Note FCP (the Fibre Channel equivalent of iSCSI) carries SCSI commands over a Fibre Channel SAN.
Refer to the IETF standards for IP storage at http://www.ietf.org for information on the iSCSI protocol.
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