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Cisco SN 5428-2 Storage Router Software Configuration Guide
OL-4691-01
Chapter 1 Before Configuring SN 5428-2 Storage Router Software
Transparent SCSI Routing Overview
Basic Network Structure
Figure 1-12 shows the basic structure of a transparent SCSI routing network. IP hosts with iSCSI drivers
access the storage routers through an IP network connected to one of the Gigabit Ethernet interfaces of
each storage router. The storage routers access the intelligent storage array through a Fibre Channel
interface of each storage router. A management station manages the storage routers through an IP
network connected to the management interface of each storage router. High availability operation for
transparent SCSI routing is controlled in the intelligent storage array; therefore, an SN 5428-2 HA
network is not necessary, and the HA interface on the SN 5428-2 is disabled.
Figure 1-12 Transparent SCSI Routing Basic Network Structure
Transparent SCSI Routing Mapping and Access Control
Transparent SCSI routing occurs in an SN 5428-2 Storage Router through two types of mapping:
• Mapping iSCSI targets to physical targets
• Mapping each IP host to a Fibre Channel (FC) address
Mapping iSCSI targets to physical targets makes the physical targets accessible to IP hosts. Mapping
each IP host to an FC address—which maps the iSCSI client in the IP host to the internal FC initiator
WWPN—allows the host to be presented to a storage array as an FC host with its own FC WWPN.
Mapping iSCSI targets to physical targets consists of creating iSCSI targets that represent physical
targets in an intelligent storage array. An iSCSI target is an arbitrary name for a group of physical storage
devices; one iSCSI target is automatically created for each target made available by the intelligent
storage array.
The iSCSI target name is created automatically using the iSCSI extended unique identifier (EUI) format.
The EUI format combines the prefix “eui” with each WWPN made available by the intelligent storage
array. For example, if the WWPN of a target in a storage array were 3100112233445566, then an iSCSI
target would be created in the SN 5428-2 with the iSCSI target name of eui.3100112233445566.
Transparent SCSI routing maps iSCSI targets to physical targets using target-only mapping. Target-only
mapping maps an iSCSI target to a physical storage target and its LUNs. Any LUNs that are available
with a physical WWPN in the storage array are available with the corresponding iSCSI target and are
numbered the same as the LUNs in the storage array.
Cisco SN 5428-2
Cisco SN 5428-2
Management
station
IP host
IP host
IP
Management
85730
Contains iSCSI
driver
Contains iSCSI
driver
Intelligent storage
array
FC
FC