Re: [Libguestfs] Question about mounting QCOW2 files....

> We would like to create and write to a large sparse file but would > like to keep the file on disk itself in compact format. So we are not > talking about a file system but a single file. I guess this means > creating qcow2 disk and attach as a local device? I'm still a little unclear, but most likely: qemu-nbd -c /dev/nbd0 file.qcow2 qemu-nbd -d /dev/nbd0 The first command will attach file.qcow2 to /dev/nbd0, making it appear as a normal host device. The second will detach it.