Does TSM balance volume creation across directories for a File Device Class?

For example: If we have a File Device Class with 4 directories, say dir1, dir2, 
dir3 and dir4 (each of which is a separate LUN) - Does TSM create volumes in 
dir1 until it is full, then use dir2 and so on - or does it automatically 
distribute the volumes evenly across the directories?

Many Thanks,
   =Adrian=


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