Date: Fri, 31 Oct 2008 14:07:59 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Jeremy Chadwick <koitsu@freebsd.org> Cc: Christoph Kukulies <kuku@kukulies.org>, freebsd-questions@freebsd.org Subject: Re: fastest raw device copy? Message-ID: <20081031140730.Y1584@wojtek.tensor.gdynia.pl> In-Reply-To: <20081031110159.GA30244@icarus.home.lan> References: <490AC650.3000904@kukulies.org> <20081031110159.GA30244@icarus.home.lan>
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> In general, what you're doing is correct for a block copy. There is > nothing (that I know of) which is faster; you're copying 500GB of data > (including the unused portion -- you *did* ask for a block copy), > and this takes a long time. Be patient. > > 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. should be big but less than drive's buffer, and be multiply of sector size.
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