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Date: Sun, 12 Mar 2006 16:53:07 +0300
From: "Andrew Pantyukhin" <infofarmer@gmail.com>
To: "Wojciech Puchar" <wojtek@tensor.3miasto.net>
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References: <001901c64517$9d891950$6701a8c0@GRANT> <44138FC9.30900@daleco.biz>
	<20060312105141.K18712@chylonia.3miasto.net>
Cc: Grant Peel <gpeel@thenetnow.com>, freebsd-questions@freebsd.org
Subject: Re: dd - cloning a disk.
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On 3/12/06, Wojciech Puchar <wojtek@tensor.3miasto.net> wrote:
> >
> > It is, with a few 'buts'. Firstly, the source should be mounted
>
> but may not - unless system is generally idle. fsck will be checking the
> copy then, but with success.

No matter what fsck says later, it's too dangerous. A FreeBSD
system (as well as any other complicated OS) is never really
idle in terms of disk I/O.


On 3/12/06, Wojciech Puchar <wojtek@tensor.3miasto.net> wrote:
> > list sometime in the last 3-5 weeks.  Giorgios Keramidas
> > commented that "dd" was too slow for his tastes and
>
> dd is the fastest, but probably he used small block size. 64K is OK

dd can be slower than dump/restore in quite a few cases,
especially when disk is far from full.