If the utility detects that a coordinator disk has existing keys, you see a message that resembles:

There are Veritas I/O fencing keys on the disk. Please make sure
that I/O fencing is shut down on all nodes of the cluster before
continuing.

         ******** WARNING!!!!!!!! ********

THIS SCRIPT CAN ONLY BE USED IF THERE ARE NO OTHER ACTIVE NODES 
IN THE CLUSTER!  VERIFY ALL OTHER NODES ARE POWERED OFF OR 
INCAPABLE OF ACCESSING SHARED STORAGE.

If this is not the case, data corruption will result.

Do you still want to continue : [y/n] (default: n) y

The utility prompts you with a warning before proceeding. You may continue as long as I/O fencing is not yet configured.