I have the similar Issue.

SQL 2005 Cluster with a san box attached. After the Cluster was configured we added a drive on the san ( G.) Now we want to create a maintenance plan so the back up copy to the G drive rather than the local D or E Drive. I can't see the G drive in the context of Management Studio when creating the maintenance plan.

I can only accomplish the task using a share. G=\\sql\backups

Is there a way to get the cluster to see the G drive as a local drive?