HP StorageWorks IP Storage Router - Manual (Page 64)

Software Overview
64 IP Storage Router SR2122-2 User Guide
Figure 34: SCSI Routing basic network structure
SCSI Routing Mapping and Access Control
SCSI routing occurs in the storage router through the mapping of physical storage
devices to iSCSI targets. An iSCSI target (also called logical 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. If the LUN is available, it is made
available as an iSCSI LUN and numbered with the iSCSI LUN number specified.
For example, if an iSCSI target and iSCSI LUN specified as Database, LUN 9
were mapped to the physical storage address, WWPN 3100112233445566, LUN
12, then LUN 12 would be available as one iSCSI LUN. An iSCSI driver would
see the iSCSI target named Database, with one iSCSI LUN identified as LUN 9.
The iSCSI LUN would appear as one storage device to a host (see
Table 5 ).
IP hosts
IP HA Mgmt
Mgmt
station
HP SR2122-2
Contains
iSCSI driver
FC storage
HP SR2122-2
Contains SR2122-2
software
Contains
iSCSI driver
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