I saw that oracle does have some tips for using nfs shares for it's own db server 

http://docs.oracle.com/html/B14399_01/app_nas.htm#CHDIAGAD

Also from nfs4 file locking changes seems that we can allow firebird server on shares

http://docs.oracle.com/cd/E19253-01/816-4555/rfsrefer-139/index.html