Date: Fri, 31 Oct 2008 16:10:31 +0100 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-questions@freebsd.org Cc: Christoph Kukulies <kuku@kukulies.org>, Ivan Voras <ivoras@freebsd.org> Subject: Re: fastest raw device copy? Message-ID: <200810311610.31851.pieter@degoeje.nl> In-Reply-To: <490B17D2.6010000@kukulies.org> References: <490AC650.3000904@kukulies.org> <gef0dq$l8a$1@ger.gmane.org> <490B17D2.6010000@kukulies.org>
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On Friday 31 October 2008, Christoph Kukulies wrote: > Ivan Voras schrieb: > > 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 > >>> using dd right now, > >>> > >>> dd if=/dev/ad0 of=/dev/da0 bs=10000000 > >> > >> On the flip side, your blocksize (bs) there is quite high for no good > >> reason. I'd pick something more like bs=64k or bs=128k. The default > >> (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 > > thing: > > > > dd if=/dev/ad0 of=/dev/da0 bs=1m > > OK, I understand that 10000000 isn't good, I just thought it wouldn't > harm. But if it is a transfer rate killer then I'd better think of > typing ^C now. The command is running for 6 hours now. > > An idea how I can check the current amount of transfered byed alongside > the running dd command? Or watch the current i/o rate? Press ^T. It will show you progress and I/O speed. -- Pieter de Goeje
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