Hello,   When you upgrade firmware it swaps controllers.   I suspect you will find that only one interface on what was the passive is wired up.  Very common problem.   If the ports have an IP address and the requested status is up, but there's no link, that's another indication that either there's no cable connected, or the ports themselves are turned off.   If you restart the array it will go back to the original controller.    Are you planning on staying at that release?   It's pretty old.    Regards, 
After moving from firmware 4.3.7 to 5.0.8 and restarting there is only one NIC available on my PS5000E.  I have tried using the Group Manager as well as the EqualLogic command line to bring up the interfaces.  Wondering if there is anything else I can try before I send someone to the datacenter to check out the physical side of things.  One thing I noticed was that the controller that was in standby is now active. Seems like part of the restart process though.
All but one NIC down after firmware update - PS5000E