Cluster Harddrive Using Firewire?

Ironstorm asks: "Recently I've started to see Firewire harddrives being sold from companies like Maxtor & Western Digital and now I'm pondering firewire storage solutions for high-availability clusters. Does anyone know if it would be possible to share a harddrive between two cluster nodes on a Firewire bus? Or have a node mount another node's Firewire drive if the other node has failed?"