Passenger running Rails site on GlusterFS

I would like to use GlusterFS to share Rails applications. Rails apps
will run using Apache and Passenger. Do you see any problem in sharing
Rails files? What about the tmp directory? If you do not know
GlusterFS, it is like NFS but HA and load-balanced.

The idea is to deploy in one point, and immediately share the code
with all servers. Plus any file uploaded or anything in /public will
be shared immediately.

I am waiting for the second server to test this solution but I would
like to know your thoughts.