Date: Thu, 09 Feb 2006 18:48:56 -0600 From: Kevin Kinsey <kdk@daleco.biz> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: freebsd-questions@freebsd.org Subject: Re: Using dd to Make a Clone of a Drive Message-ID: <43EBE2F8.8000501@daleco.biz> In-Reply-To: <20060209220123.GA4751@flame.pc> References: <200602092036.k19KaIhn086956@dc.cis.okstate.edu> <20060209220123.GA4751@flame.pc>
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Giorgos Keramidas wrote: >On 2006-02-09 14:36, Martin McCormick <martin@dc.cis.okstate.edu> 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. >> >> > >Bah! That's too slow for my taste. I would usually go for a newfs, >dump, and restore option. For instance, to create a copy of /usr on a >second disk: > > newfs -U /dev/ad1s1a > mount /dev/ad1s1a /mnt > dump -0 -a -L /usr | ( cd /mnt ; restore ruvf - ) > >Copying with dd(1) is not as fast :) > > > Sorry to butt in --- but I'm needing to start cloning too. Looks like a winner to me ... wouldn't this have the added advantage of making "same size and geometry" (cf. Erik Trulsson, 4 hours ago, this thread) less relevant? As long as the "new" slice had enough space, geometry shouldn't matter to dump|restore .... <?> Kevin Kinsey -- A committee is a group that keeps the minutes and loses hours. -- Milton Berle
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