From owner-freebsd-questions@FreeBSD.ORG  Wed Sep 30 03:27:41 2009
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Date: Tue, 29 Sep 2009 21:27:37 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Polytropon <freebsd@edvax.de>
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Cc: PJ <af.gourmet@videotron.ca>, freebsd-questions@freebsd.org
Subject: Re: backups & cloning
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On Wed, 30 Sep 2009, Polytropon wrote:

> Forgot to mention this:
>
>
> On Tue, 29 Sep 2009 22:23:00 -0400, PJ <af.gourmet@videotron.ca> wrote:
>> 1. will the s1a slice dump the entire system, that is, the a, d, e, f
>> and g slices or is it partitions?
>
> The ad0s1 slice (containing the a, d, e, f and g partitions) can
> be copied 1:1 with dd. By using dump + restore, the partitions
> need to be copied after another. In each case, the entire system
> will be copied. For this purpose, even the long lasting
>
> 	# dd if=/dev/ad0 of=/dev/da0 bs=1m

This copies everything on the disk, including sectors not used by a 
filesystem.  So it usually takes a while.

> 	# dd if=/dev/ad0 of=/dev/da0 bs=512 count=1

Not necessary, the first block was already copied, well, first.

-Warren Block * Rapid City, South Dakota USA