[Libguestfs] Why is virt-resize designed to involve two disks?

[Zhi Yong Wu]

On Tue, Sep 23, 2014 at 8:11 PM, Richard W.M. Jones <rjones at redhat.com> wrote:
> On Tue, Sep 23, 2014 at 06:19:21PM +0800, Zhi Yong Wu wrote:
>> As you've known, vhd-util and qemu-img both provide the capacity for
>> resizing the original disk,
>
> .. although they only resize the container, not the contents which is
> what virt-resize does.  So these tools are not really comparable.
Yes.
>
>> but why is virt-resize designed to involve
>> two disks, not only original disk? Is there any concern? Is it
>> possible that only one original disk is involved in virt-resize?
>
> I'm guessing this question is why virt-resize doesn't work on disk
> images in-place.
>
> This I hope is answered in the FAQ here:
>
>   http://libguestfs.org/guestfs-faq.1.html#why-doesnt-virt-resize-work-on-the-disk-image-in-place
It is really what i want, thanks.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
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> http://people.redhat.com/~rjones/virt-top



-- 
Regards,

Zhi Yong Wu