From owner-freebsd-hackers@FreeBSD.ORG  Wed Mar 29 04:05:03 2006
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To: eksffa@freebsdbrasil.com.br
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: cloning a FreeBSD HDD
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In message: <4429972C.5030806@freebsdbrasil.com.br>
            Patrick Tracanelli <eksffa@freebsdbrasil.com.br> writes:
: 
: >> I heard its faster if you use two dd's; i.e:
: >>
: >>    # dd if=/dev/ad0 bs=64k | dd of=/dev/ad1 bs=64k
: >>
: >> allowing read and write to proceed in parallel.
: > 
: > 
: > that's what ddd and 'team' are for.
: > I don't know if ddd is in the ports as it may clash inname with teh 
: > debugger ddd
: > They internally fork and use several processes synchronised in some manner.
: 
: Isn't dump+restore and a couple of fdisk+bsdlabel trick to copy the 
: source partitioning a better choice to "clone" this HDD?

Yes.  That's what I *ALWAYS* do, because hard drives are never the
exact same size.

fdisk -I makes the fdisk part easy.  bsdlabel -R makes the disklabel
cloning relatively painless.

dump + restore is slow but reliabe.

Warner