On Wed, Feb 28, 2024 at 11:17:37AM +0100, Kevin Wolf wrote: > Until now, @size has been mandatory for creating images with every > driver. Maybe we should even have put it into BlockdevCreateOptions's > base, because without a size, you're not really creating an image.
NB, @size isn't mandatory for creating images. It isn't required when creating qcow2 files with backing stores, as the size is acquired from the backing file instead. $ qemu-img create demo.raw 1g Formatting 'demo.raw', fmt=raw size=1073741824 $ qemu-img create -o backing_file=demo.raw -o backing_fmt=raw -f qcow2 demo.qcow2 Formatting 'demo.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=1073741824 backing_file=demo.raw backing_fmt=raw lazy_refcounts=off refcount_bits=16 With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
