It is referring to the EMC management domain.  You will/may need to re-add the unit to that domain, through Unisphere for instance.   ...and with due respect I don't believe that changing the IP causes a SP reboot...it has been a while, but I seem to recall just doing it through Unisphere and having no real difficulties.
Hello there. I got VNX 5400 with flare 05.33.008.5.119. There are few hosts (ESXi) registered on this storage and these hosts are attached to few LUNs by FC. Now I want to change SPA/SPB management IPs (new IPs would be at the same network as the old IPs). Is it possible to face some problems after this procedure?
VNX5400 change management IPs