AIX provides two configuration options to modify the behavior of the Fibre Channel (FC) drivers when events occur in the SAN. These options are Fast I/O Failure and Dynamic Tracking. Oracle recommends that you enable both of these options for all FC ports used to connect to the Oracle FS System system, unless other software or hardware components using these ports require a different setting.
More information about these two options can be found in the AIX documentation (http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.prftungd/doc/prftungd/log_vol_disk_io_perf.htm).