IBM Storwize V7000 Unified Manual page 134

v The Interface drop down menu specifies the network interface (for example,
ethX1) to use for attaching the network. It is important to make a selection. If
you leave the selection as Not Attached you are unable to attach new public
addresses to the network
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IBM Storwize V7000 Unified: Adding Storwize V7000 File Modules to an existing Storwize V7000 system 2073-720