Gluster users - Aug 2014 - Enforce direct-io for volume rather than mount

Suppose I have a replica 2 setup using XFS for my volume, and that I also export
my files over nfs, and write access is expected.

Now if I wish to avoid split brains at all cost, even during server crashes and
such, I am given to understand that direct-io mode would help. I know that there
is a direct-io option with my mount.glusterfs program, but I wish for a
direct-io enforcement for my entire volume so as to enforce uncached writes to
the underlying XFS.

Any ideas on how I could achieve that? 

Thanks for your replies.
Anirban
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