Error Message: 
The error below was seen when attempting to start IO Fencing:

# /etc/init.d/vxfen start
Starting vxfen.. 
ERROR: invalid value raw in /etc/vxfenmode file

Cause: 
From 6.2, raw policy is not supported 
The /etc/vxfenmode scsi3_disk_policy had the "raw" option
.
.
scsi3_disk_policy=raw

Solution: 
The suggestion was made to update the policy to "dmp", which enabled IO Fencing to be started.