CLARiiON Optimized (CLAROpt) is the recommended policy setting. Failover mode 4 is recommended setting  glen
I checked several documents but could not find the recommended PowerPath failover policy, such as adaptive, basic failover, Clariion optimization (P.258-260 EMC PowerPath Family 6.x CLI and System Messages Reference) for Unity.  Does anybody know which policy is suitable for Unity?
Unity: PowerPath recommended failover policy?