HP StorageWorks 2.140 Director Switch - Manual (Page 209)

Optional Features
207 Director Element Manager User Guide
Insistent Domain Identification (ID)
This is a parameter in the Configure Switch Parameters dialog box, available from
the Configure menu in the Element Manager. Enabling this option sets the
domain ID configured in the Preferred Domain ID field in the Configure Switch
Parameters dialog box as the active domain identification when the fabric
initializes. A static and unique domain identification is required by the Fabric
Binding feature because the feature's Fabric Membership List identifies switches
by WWN and domain ID. If a duplicate preferred domain ID is used, then insisted,
warnings occur when directors and switches are added to a Fabric Membership
List.
If Fabric Binding or Enterprise Fabric Mode is enabled, this option is
automatically enabled and cannot be disabled unless these options are disabled
when the director or switch is offline. If the director or switch is online, disabling
Insistent Domain ID will disable Enterprise Fabric Mode and Fabric Binding.