[Libguestfs] libguestfs support snapshot based virutal disk analysis?

[Alex Nelson]

(Sorry, Rich, I managed to miss reply-all.)

These VMDK files are difference files from a baseline VMDK file.

I'm not familiar with ESX's storage, but the size indicators on these tell
me they aren't raw.  For a virtual disk that has 3.2GB of data in its
current state, against 3.0GB of data in its baseline, the current state's
.vmdk file is 200MB.

--Alex


On Mon, Jun 10, 2013 at 6:11 AM, Richard W.M. Jones <rjones at redhat.com>wrote:

> On Sun, Jun 09, 2013 at 05:49:44PM -0400, Alexander Nelson wrote:
> > I've used QEMU to read .vmdk snapshots.  The VM directory layout in my
> case
> > (Fusion, and I've seen Workstation do the same) created a .vmdk file per
> > snapshot, and qemu-img could use that .vmdk file and the base .vmdk to
> > convert the disk image to a raw image. IIRC there is a manifest file that
> > ties .vmdk files to the snapshot they represent.
> >
> > So, from my experience, qemu does read disk snapshots in the .vmdk
> > format. It might need a little extending to also look for and parse that
> > manifest file, to treat a directory with .vmdk's as a snapshot tree.
>
> Are these real VMDK files, or do you mean the "vmdk" files which
> are really raw that ESX produces?
>
> TBH I don't know a lot about the VDMK format, except that the
> specifications are intimidating.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
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>
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