replacing shmem

Excuse my ignorance.
Is there a way to replace the shmem and sem (ipc.c) to use files. In this
way we can have a sort of a parallel server using GFS.
1.Starting a postmaster on ONE machine creates the shared structures, 2.then
start on other cluster-machines, the variuos machines share the same
datafiles and shared memory (on-file) structures
3.cliets connects (for example) round-robin to the clustered-postgres-nodes.
4.a problem is proper destroy and create of the shared structures

thanks,
valter

>From http://sistina.com/gfs/:

he Global File System (GFS [now in beta4]) is a shared disk cluster file
system for Linux. GFS supports journaling and recovery from client failures.
GFS cluster
nodes physically share the same
storage by means of Fibre Channel or shared SCSI devices. The file system
appears to be local on each node and GFS
synchronizes file access across the
cluster. GFS is fully symmetric, that is, all nodes are equal and there is
no server which may be a bottleneck or
single point of failure. GFS uses read
and write caching while maintaining full UNIX file system semantics.

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