Date: Thu, 09 Feb 2006 16:24:19 -0500 From: Mike Jeays <mj001@rogers.com> To: Martin McCormick <martin@dc.cis.okstate.edu> Cc: freebsd-questions@freebsd.org Subject: Re: Using dd to Make a Clone of a Drive Message-ID: <1139520259.4288.32.camel@chaucer.jeays.ca> In-Reply-To: <200602092036.k19KaIhn086956@dc.cis.okstate.edu> References: <200602092036.k19KaIhn086956@dc.cis.okstate.edu>
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On Thu, 2006-02-09 at 14:36 -0600, Martin McCormick wrote: > After installing FreeBSD5.4, the ISC dhcp server and ISC bind > on a hard drive, I wanted to clone that drive to a second drive so as > to generate a second server, using what I had already installed as a > template. I used the following command: > > dd if=/dev/da0 of=/dev/da1 bs=512 > > It turns out that dd defaults to 512-byte blocks so I didn't > really need the bs=512, but I am not sure I haven't made some other > type of mistake. The dd command has been running for about 4 hours on > a very fast system, with a 1-gig processor, 1 gig of RAM and two 31-GB > drives. One would think it should have finished by now, but it is > still running. Is this a valid method of copying the entire contents > of one drive to another? Thank you. > > > Martin McCormick WB5AGZ Stillwater, OK > Systems Engineer > OSU Information Technology Department Network Operations Group > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" -- Mike Jeays http://ca.geocities.com/mike.jeays@rogers.com You can use a much bigger block size, and the job will take significantly less time to run. I have successfully used a blocksize of 512000. Keep it to a multiple of 512. I haven't tried even larger block sizes, but I think they would work fine.
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