IBM Midrange System DS4000 Series Hardware Manual page 232

Define Host Group option
Because the host groups can be created with the Define Host wizard, there is usually no need
to define the groups from outside the wizard. But you still have the option to do so by
performing the following steps:
1. Right-click Default Group and select Define Host Group, as shown in Figure 4-81.
Figure 4-81 Define Host Group
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IBM Midrange System Storage Hardware Guide