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Date:      Sun, 1 Feb 2009 14:34:08 +0100 (CET)
From:      Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To:        Andrew Hamilton-Wright <andrewhw@ieee.org>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: dump(8) using snapshot + "recommended" cache
Message-ID:  <20090201143340.U65379@wojtek.tensor.gdynia.pl>
In-Reply-To: <alpine.BSF.2.00.0902010838030.1180@qemg.org>
References:  <alpine.BSF.2.00.0902010838030.1180@qemg.org>

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>
> I regularly use dump(8) with snapshots to back up my server.
>
> While this seems to have been working perfectly well so far,
> upon (re)reading the man page for dump(8), I have noticed a
> somewhat scary pair of lines in the paragraph describing
> the option for -C <cachesize> (emphasis with stars mine):
>
> 	[Use of this option] will greatly improve performance
> 	at the cost of ***dump possibly not noticing changes in
> 	the file system*** between passes.
>
> 	***It is recommended that you always use this option when
> 	dumping a snapshot.***
>
> Does anyone know what, exactly, this means?

no, in my experience it's no difference in speed with this enabled or not.



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