Date: Mon, 3 Nov 2008 01:04:52 +0100 From: Nikola =?UTF-8?B?TGXEjWnEhw==?= <nikola.lecic@anthesphoria.net> To: Ivan Voras <ivoras@FreeBSD.org>, Jeremy Chadwick <koitsu@FreeBSD.org>, Christoph Kukulies <kuku@kukulies.org> Cc: FreeBSD-questions@FreeBSD.org Subject: Re: fastest raw device copy? Message-ID: <20081103010452.6a1f0521@anthesphoria.net> In-Reply-To: <gef0dq$l8a$1@ger.gmane.org> References: <490AC650.3000904@kukulies.org> <20081031110159.GA30244@icarus.home.lan> <gef0dq$l8a$1@ger.gmane.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: RIPEMD160 On Fri, 31 Oct 2008 14:16:38 +0100 Ivan Voras <ivoras@freebsd.org> wrote: =20 > Jeremy Chadwick wrote: > > On Fri, Oct 31, 2008 at 09:48:16AM +0100, Christoph Kukulies wrote: >=20 > >> What would be the fastest way to do that sector by sector copy? > >> I'm using dd right now, > >> > >> dd if=3D/dev/ad0 of=3D/dev/da0 bs=3D10000000 >=20 > > 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 > > default (512) is too small for what you want, but 10MBytes is silly. >=20 > 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 > thing: >=20 > dd if=3D/dev/ad0 of=3D/dev/da0 bs=3D1m Would there be anything wrong in cat /dev/ad0 > /dev/da0 ? - --=20 Nikola Le=C4=8Di=C4=87 =3D =D0=9D=D0=B8=D0=BA=D0=BE=D0=BB=D0=B0 =D0=9B=D0= =B5=D1=87=D0=B8=D1=9B fingerprint : FEF3 66AF C90E EDC3 D878 7CDC 956D F4AB A377 1C9B ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iJwEAQEDAAYFAkkOQCsACgkQ/MM/0rYIoZjjHQQAhXi6gu5JhJjzZmE97buiZ15u Q6AT+qvAja6cALfGAGVrzJEzljfcbe3PnBdOnn1CTYbS62EHaVWLnvOKRGrpvzFE q/WxQ9qCRfcsSx3o6eKxfTM6d4b92ZP+d1iPotmzutQl8TbxlJxNTP9i2b6cDw6a au6zdoApH5A6UxyaJA8=3D =3DoFoQ -----END PGP SIGNATURE-----
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