How are discs managed under a RAC data server

I am considering using Oracle 9i for a very large database and I am being offered RAC as a scalable architecture. I am trying to find out how the 'shared disc' part of the architecture maps into physical reality. All storage devices in my experience can only attach an individual logical unit of storage to one server at any one time. There is no mechanism to request use of a shared resource. (The logical unit can however be passed around between servers in a cluster transition).
There are two obvious mechanisms:-
1)Oracle has a request/lock/release mechanism to pass logical units around between nodes.
2)Cache Fusion abstracts the physical layer so that the location of the storage is invisible. The storage is shared between the nodes and each piece of physical storage attached to one database node.
Or it could be something I have not thought of.
Any information gratefully received.

Here you can see all the process flows : http://scn.sap.com/docs/DOC-8292
Input file server is used to retrieve/save report, output is used to store report instances.
If you have multiple FRS servers - they all have to point to the same shared location (one for IFRS and one for OFRS)
Report processing servers utilize local cache directories. In some cases it makes sense to share them in some not.
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