IBM Storwize V5010 Manual page 264

Creating offline hosts: If you want to create hosts that are offline or not connected
currently, you can enter the WWPNs manually. Type them into the Host port (WWPN)
field and add them to the list. See Figure 5-45.
Figure 5-45 Manually added WWPN
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Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1