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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
SCSI Routing Overview
Basic Network Structure
Figure 1-7 shows the basic structure of a SCSI routing network. IP hosts with iSCSI drivers access the
storage routers through an IP network connected to the Gigabit Ethernet interface of each storage router.
The storage routers access storage devices connected to the Fibre Channel interfaces of each storage
router. A management station manages the storage routers through an IP network connected to the
management interface of each storage router. For high availability (HA) operation, the storage routers
communicate with each other over two networks: the HA network connected to the HA interface of each
storage router and the management network connected to the management interface of each storage
router.
Figure 1-7 SCSI Routing Basic Network Structure
SCSI Routing Mapping and Access Control
SCSI routing occurs in the SN 5428-2 Storage Router through the mapping of physical storage devices
to iSCSI targets. An iSCSI target is an arbitrary name for a group of physical storage devices. You can
map an iSCSI target to multiple physical devices. An iSCSI target always contains at least one Logical
Unit Number (LUN). Each LUN on an iSCSI target is mapped to a single LUN on a physical storage
target.
You can choose either of two types of storage mapping: target-and-LUN mapping or target-only
mapping. Target-and-LUN mapping maps an iSCSI target and LUN combination to a physical storage
target and LUN combination. Target-only mapping maps an iSCSI target to a physical storage target and
its LUNs.
With target-and-LUN mapping, an iSCSI target name and iSCSI LUN number are specified and mapped
to the physical storage address of one LUN; either a WWPN + LUN (World Wide Port Name + LUN)
combination, a LUN ID (unique LUN identifier), or a LUN serial number.
Cisco SN 5428-2
Cisco SN 5428-2
Management
station
Contains SN 5428-2
software
IP host
IP host
85725
Contains iSCSI
driver
Contains iSCSI
driver
FC storage
IP
Management
HA