gather write metrics on multiple files

[Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>]

Does anyone know of a utility that can track writes to files in an XFS 
directory tree, or filesystem wide for that matter, and gather filesystem 
blocks written per second data, or simply KiB/s, etc?  I need to analyze an 
application's actual IO behavior to see if it matches what I'm being told the 
application is supposed to be doing.

Thanks,
Stan