[Linux-cluster] Possible to Share Berkeley DB Environment via GFS?

[Brian C. O'Berry]

Is it possible to share a Berkeley DB environment, via a common GFS 
filesystem, between Concurrent Data Store applications running on 
different systems?

In reference to *remote* filesystems, the Berkeley DB Reference Guide 
states that

"Remote filesystems rarely support mapping files into process memory, 
and even more rarely support correct semantics for mutexes after the 
attempt succeeds. For this reason, we strongly recommend that the 
database environment directory reside in a local filesystem... For 
remote filesystems that do allow system files to be mapped into process 
memory, home directories accessed via remote filesystems cannot be used 
simultaneously from multiple clients. None of the commercial remote 
filesystems available today implement coherent, distributed shared 
memory for remote-mounted files. As a result, different machines will 
see different versions of these shared regions, and the system behavior 
is undefined."

Based on that, I'd expect sharing the environment (home) directory 
between systems to be infeasible, but I know little about GFS.  Can 
someone verify one way or the other whether such sharing is possible?

Thanks,

Brian