>But I don't know an easy, automated, reliable way to get it done. Run DFDSS 
>defrags hourly, every 8 hours, every day, ... ?

We used to run it frequently, daily, half-daily, and by shift.
But, with a fragmentation index.

The first time was slow, but each subsequent run sped up.

Also, we would defrag test volume at night, and Production (batch) during the 
day.

Online rarely needed it.
-
Too busy driving to stop for gas!

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