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Date: Tue, 21 Apr 2015 00:30:37 -0700 (PDT)
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Subject: Truncating Direct IO files
From: tonyg <tonythegair@gmail.com>
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Date: 2015-04-21T00:30:37-07:00
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I am recording records to disk. Sometimes I replace thes records with a smaller set of records.
    I could delete the file each time but would prefer to truncate the file. I can't see a way of doing this, can you?