GlusterFS's translator feature is very flexible and there are quite a lot of ways one 
can configure their filesystem to behave like. 

Volume Specification is a way in which GlusterFS understands how it has to work, based 
on what is written there. 

Going through the following URLs may give you more idea about all these.

* http://www.gluster.org/docs/index.php/GlusterFS
* http://www.gluster.org/docs/index.php/GlusterFS_Volume_Specification
* http://www.gluster.org/docs/index.php/GlusterFS_Translators

Mail us any doubts, suggestions on 'gluster-devel(at)nongnu.org'