Date: Mon, 3 Nov 2008 11:04:22 -0600 From: Matt <datahead4@gmail.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-questions@freebsd.org Subject: Re: copying 'holey' files ... Message-ID: <cd6b4a5b0811030904r77f1e664jd89bdb1b7400c4c9@mail.gmail.com> In-Reply-To: <F051A44CEADE0E79AEA7654E@ganymede.hub.org> References: <F051A44CEADE0E79AEA7654E@ganymede.hub.org>
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On Mon, Nov 3, 2008 at 10:40 AM, Marc G. Fournier <scrappy@hub.org> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > I have a disk img for qemu that is 4G, but disk usage is only 650M ... due to > how the image is created, it will grow to 4G, but only uses as much as it needs > ... but, if I run a simple 'cp' on the file, it goes from: > > image: debian.img > file format: raw > virtual size: 4.0G (4294967296 bytes) > disk size: 652M > > to: > > image: dtc.img > file format: raw > virtual size: 4.0G (4294967296 bytes) > disk size: 4.0G > > Is there a way of moving things around such that it *maintains* the holes, > instead of fills them in? > The "qemu-img" program using the "convert" command should do what you want it to. I've used it to make copies of qcow-format disks without having them grow to their max-size. Matt
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