On 08/12/2014 07:45 AM, 吴兴博 wrote: [please don't top-post on technical lists]
> Thanks for your information. It's really helpful. > I think adding a bitmap alongside the raw file ( or just within that file) Umm, how do you propose to add a bitmap within a raw file? The moment the file contains metadata, it is no longer raw, but some other format. You'd need a way to reliably delineate the portion of the file that contains the bitmap and therefore must not be exposed to the guest. > would be suffice to distinguish between present or in backing file. > The idea in FVD looks similar to 'addcow'---use bitmap but delegating > allocation to FS. However FVD seems to have been ignored by community. Care to give a pointer to a URL describing the FVD format? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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