I have never worked with apple cluster, but a little googling tells me that cluster-wide devices would have to have been mounted with NFS. Any software you expect to function cluster-wide should be located on such devices.

Having said that, the path will of course be different on the node where the device is mounted locally than the rest.

Having modified the path in the program to agree with the NFS path for the device, what you are calling the 'head node' will then become the exception that needs hooking up again. One way to approach that would be to create a symbolic link on the 'head node' to mimic an NFS mount.