Chapter 1 Before Configuring SN 5428-2 Storage Router Software
SCSI Routing Overview
Basic Network Structure
Figure 1-7shows 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
Cisco SN 5428-2
Contains SN 5428-2 software
FC storage
IP host Contains iSCSI
driver
IP | HA | Management |
Contains iSCSI | | Management |
| station |
driver | |
| |
IP host
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 Storage Router Software Configuration Guide
