228 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
6.3.1  External storage controllers
You can manage both FC and iSCSI storage controllers through the External Storage pane. 
To access the External Storage pane, browse to Pools → External Storage, as shown in 
Figure 6-48.
Figure 6-48   External Storage pane
If External Storage does not appear in Pools, virtualization licenses are not configured. To 
use Storwize V7000 virtualization functions, you must order the correct External Virtualization 
licenses. You can configure them by clicking Settings → System → Licensed Functions. 
For assistance with licensing questions or to purchase any of these licenses, contact your 
IBM account team or IBM Business Partner. 
The External Storage pane lists the external controllers that are connected to the system 
and all the external MDisks that are detected by the system. The MDisks are organized by the 
external storage system that presents them. Toggle the sign to the left of the controller icon to 
show or hide the MDisks that are associated with the controller.
If you configured logical unit names on your external storage systems, it is not possible for the 
system to determine these names because they are local to the external storage system. 
However, you can use the LU UID’s, or external storage system WWNNs and LU number, to 
identify each device.
To list all visible external storage controllers with CLI, use lscontroller, as shown in 
Example 6-22.
Example 6-22   Listing controllers with the CLI (some columns are not shown)
IBM_Storwize:ITSOV7K:superuser>lscontroller
id controller_name ctrl_s/n             vendor_id            product_id_low 
0  controller0     2076                 IBM                  2145 
1  controller1     2076                 IBM                  2145
2  controller2     2076                 IBM                  2145 
<...>
System layers
System layers must be configured if the external controller is a Storwize system. By default, 
IBM Storwize V7000 is set to storage layer. With it, it cannot virtualize another IBM Storwize 
system, configured to the same layer. To do that, the system must be set to replication layer. 
Note: A controller that is connected through Fibre Channel is detected automatically by the 
system. The cabling, the zoning, and the system layer must be configured correctly. A 
controller that is connected through iSCSI must be added to the system manually.
Depending on the type of back-end system, it might be detected as one or more controller 
objects.