Hi Jean,

You may refer to the Installation guide available at

Refer to Chapter - 3 (configuring a powrpath boot device on aix)

https://support.emc.com/docu32216_PowerPath_for_AIX_5.5_Installation_and_Administration_Guide.pdf

Ensure that the Failover mode on clariion is set to 3 or 4

You would have to uninstall EMC.CLARiiON.fcp.MPIO.rte and install EMC.CLARiiON.aix.rte

Since this is boot from SAN - ensure you refer to section "PowerPath and the bosboot tool"