DE Series HIMG 11.70.3,vCenter-plugin 1.3 - Why do I not see all of my storage arrays?

During the Import Settings operation, some of your storage arrays might not be available in the target selection dialog box.

Storage arrays might not appear for the following reasons:

The firmware version is below 8.50.
The storage array is offline.
The system cannot communicate with that array (for example, the array has certificate, password, or networking problems).