Just to add a bit more detail to Richard's post, the CX4 will operated with no disruption; but not exactly normally.  Navisphere/Unisphere will display a serieds of Alerts indicating that power has been lost.  Additionally if you have configured email alerts you will get one or more emails indicating the disruption in power.
Hypothetical Question / Temporary Loss of Power: Environment: CLARiiON CX4-480 Power: 1 half UPS / 1 half generator Question, what does the CLARiiON do if it would lose power to have of the array… meaning only the A and or B until the generator starts up and provides power?
Loss of Power Question