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List:       veritas-bu
Subject:    Re: [Veritas-bu] Duplicating using bpduplicate gives a smaller size
From:       A Darren Dunham <ddunham () taos ! com>
Date:       2010-10-25 18:31:31
Message-ID: 20101025183130.GA23930 () SDF ! LONESTAR ! ORG
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On Thu, Oct 21, 2010 at 05:23:39AM -0400, Tamimi wrote:
> Hi All, 
> 
> I converted LTO1 tapes to LTO4 tapes using bpduplicate. LTO1 tape read
> with LTO2 tape drives (compressed) and write to LTO4 tape drives
> (compressed). The result were some of the images have the same size
> and some have smaller size.

How are you calculating size in this case?  I'm not exactly sure what
you're looking at.

> My question is: 
> - Is it a normal behavior? 
> - Why? Is it because the difference compression algorithm between two
> tape drive? 

That's possible.

> - Why some of duplication also result at the same size? 
> - How can we be sure that the result is OK not corrupted? 

Same way you would tell that the first one isn't corrupted.  You'd have
to do test restores.

-- 
Darren
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