If an EVA storage system is in a situation where any of the arrays is not functional or not responding, HP SUM will continue to wait/retry the discovery process until the array returns to functional again. This is working as designed.
It is therefore necessary to make sure all the arrays in the EVA are functional before starting HP SUM.
To download the HP SUM User Guide, go to http://www.hp.com/go/hpsum/documentation.