Date: Fri, 31 Oct 2008 14:16:38 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: fastest raw device copy? Message-ID: <gef0dq$l8a$1@ger.gmane.org> In-Reply-To: <20081031110159.GA30244@icarus.home.lan> References: <490AC650.3000904@kukulies.org> <20081031110159.GA30244@icarus.home.lan>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig6A75BBE435C7D5E489DF7E41 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Jeremy Chadwick wrote: > On Fri, Oct 31, 2008 at 09:48:16AM +0100, Christoph Kukulies wrote: >> What would be the fastest way to do that sector by sector copy? I'm =20 >> using dd right now, >> >> dd if=3D/dev/ad0 of=3D/dev/da0 bs=3D10000000 > On the flip side, your blocksize (bs) there is quite high for no good > reason. I'd pick something more like bs=3D64k or bs=3D128k. The defau= lt > (512) is too small for what you want, but 10MBytes is silly. Not only that, but "10000000" isn't even correct - it needs to be a multiple of sector size. Generally, using suffixes will do the right thin= g: dd if=3D/dev/ad0 of=3D/dev/da0 bs=3D1m --------------enig6A75BBE435C7D5E489DF7E41 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJCwU2ldnAQVacBcgRAt9RAKDQI13rdhkjPwJ2qgcFDy7oWFvIjQCgyhWc J2+LuU157FnLhikw2rmmZBE= =rb04 -----END PGP SIGNATURE----- --------------enig6A75BBE435C7D5E489DF7E41--
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