"Marc G. Fournier" <[EMAIL PROTECTED]> wrote: > 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?
Quoting dd(1): | conv=value[,value ...] | Where value is one of the symbols from the following list. [...] | sparse If one or more output blocks would consist solely of | NUL bytes, try to seek the output file by the required | space instead of filling them with NULs, resulting in a | sparse file. I haven't actually tested it with qemu images, though. Fabian
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