IBM Midrange System DS4000 Series Hardware Manual page 220

The Setup view has the option Map Logical Drives, which you can use for mapping your
logical drives to the Default group, or to previously defined hosts or groups.
Figure 4-67 shows an example of the Mappings view. The right side of the window lists all
mappings that are owned by the object you select on the left side. If you highlight the storage
system, you see a list of all defined mappings. If you highlight a specific host group or host, its
mappings are listed.
Figure 4-67 Mappings view in Subsystem Management window
In our example, we show how to configure the following storage partitioning scenario:
We have a host with Windows Server 2008. We want that host to have access to the
logical drives LogDrive1 and LogDrive2 of the storage subsystem.
This host contains two FC HBAs.
At some time, the host becomes a part of the Windows 2008 cluster, so we have to put it
into a host group. The host group name will be WinGroupITSO.
We map the two logical drives (LogDrive1 and LogDrive2) to that host group.
We show how to modify the mapping to integrate it later into a cluster.
Note: Before configuring the partitions, if you have your storage connected to a FC
switch, make sure to first define the zones appropriately.
Next, perform a hardware rescan on each host that is to be mapped to the DS5000
storage subsystem to reconfigure the FC devices and allow the WWN to be presented
in the Storage Manager.
It is a best practice to configure only one host HBA per zone, together with one DS5000
storage subsystem controller.
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IBM Midrange System Storage Hardware Guide