On Tue, Jan 10, 2017 at 12:53:55PM +0100, LK wrote: > Hi, > > I thought that qcow2 would be a sparse disk format, but when I create a > new disk using virt-manager (Ubuntu 16.10, virt-manager 1.3.2), the size > of the new disk is exactly the same size I chose at creation time (as > the disk would be completely full). > > Ho can I create a dynamically allocated disk using virt-manager? Hi, they are probably allocated as sparse files. You can try to run: qemu-img info /path/to/file.qcow2 and the output should contain those two lines: virtual size: 20G (21474836480 bytes) disk size: 3.3M or you can use this command: ls -lsh and the output should be something like this: 3.4M -rw------- 1 root root 21G Jan 10 13:28 test-size.qcow2 where the first column is the sparse size. Pavel
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