On 05/12/2014 09:36 AM, Mike Day wrote: > On Mon, May 12, 2014 at 11:20 AM, Eric Blake <ebl...@redhat.com> wrote: >> Online where? In 'qemu-img --help', or on some web page (at what URL)? > > http://qemu.weilnetz.de/qemu-doc.html#vm_005fsnapshots
Not an official qemu reference; nothing we can do about out-of-date third-party references. > > -o backing file is not documented in the help command. Ah, but it is: $ qemu-img create -f qcow2 -o help Supported options: size Virtual disk size compat Compatibility level (0.10 or 1.1) backing_file File name of a base image backing_fmt Image format of the base image encryption Encrypt the image cluster_size qcow2 cluster size preallocation Preallocation mode (allowed values: off, metadata) lazy_refcounts Postpone refcount updates and more importantly, it only appears in the help output of -f modes that actually support a backing file. Contrast: $ qemu-img create -f raw -o help Supported options: size Virtual disk size -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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