Filter
Top Products
1-7
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
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 1-1.)
With target-only mapping, an iSCSI target name is specified and mapped to the physical storage address
of a storage controller only; a WWPN. Any LUNs that are available in the storage controller are made
available as iSCSI LUNs and are numbered the same as the LUNs in the storage controller. For example,
if an iSCSI target specified as Webserver2000 were mapped to the physical storage address WWPN
3100112233445577, and LUNs 0 through 2 were available in that controller, those LUNs would become
available as three iSCSI LUNs. An iSCSI driver would see the iSCSI target named Webserver2000 as a
controller with three iSCSI LUNs identified as LUN 0, LUN 1, and LUN 2. Each iSCSI LUN would
appear as a separate storage device to a host. (See Table 1-2.)
Table 1-1 Target-and-LUN Mapping Example
Apparent to Host as
Local Disk
iSCSI Target
Name
iSCSI LUN
Available
Physical Storage
Address
Physical LUN
Available
Local Disk (D:) Database LUN 9 WWPN
3100112233445566
LUN 12
Apparent as one
locally attached
storage device.
Database
appears as one
controller with
one LUN
available.
iSCSI LUN is
numbered as
specified and
can be different
than the
physical LUN
number.
Specifies the storage
address of a storage
controller.
The LUN number
is specified as the
only LUN to be
mapped.
Table 1-2 Target-only Mapping Example
Apparent to Host as
Local Disk
iSCSI Target
Name
iSCSI LUNs
Available
Physical Storage
Address
Physical LUNs
Available
Local Disk (D:) Webserver2000 LUN 0 WWPN
3100112233445577
LUN 0
Local Disk (E:) Webserver2000 LUN 1 WWPN
3100112233445577
LUN 1
Local Disk (F:) Webserver2000 LUN 2 WWPN
3100112233445577
LUN 2
Apparent as three
locally attached
storage devices.
Webserver2000
appears as one
controller with
LUNs 0, 1, and
2 available.
iSCSI LUNs
are numbered
the same as
physical LUNs.
Specifies the storage
address of a storage
controller.
LUNs 0, 1, and 2
are available for
mapping.