Date: Sun, 2 Dec 2007 02:26:34 +0000 From: RW <fbsd06@mlists.homeunix.com> To: freebsd-questions@freebsd.org Subject: Re: using dd to duplicate disks/partitions of slightly different sizes - works? Message-ID: <20071202022634.332bfc33@gumby.homeunix.com.> In-Reply-To: <200712012053.41426.mike.jeays@rogers.com> References: <539c60b90712010929m7fef7020v806eb3c1eb24d066@mail.gmail.com> <4751C1EF.4010206@daleco.biz> <200712012053.41426.mike.jeays@rogers.com>
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On Sat, 1 Dec 2007 20:53:41 -0500 Mike Jeays <mike.jeays@rogers.com> wrote: > I tried using dd with two 80GB disks, using a much larger block size > (512M), booting Knoppix to make sure the filesystems on the 'input' > disk were quiescent. It worked, but took an amazing 14 hours, which > is only about 1.5 Mb/sec. The 'output' drive was on an IDE connector > shared with the CD device, so that may have been a cause of the poor > performance. > Probably that was the cause, I've done a few: dd if=/dev/random of=<disc> bs=1m recently, and they all went an order of magnitude faster than that, even on PATA drives.
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