On 5/19/2011 5:21 PM, Alexey Eromenko wrote:
>
> VirtualBox has several layer.
>
> Once you create snapshot, previous layer becomes read-only.
> 1.Base image (normal VDI) (read-write) -- just like physical hard disk.
>
> 2. You create first snapshot. Base image becomes read-only.
> Base image (normal VDI) (read-only)
> +-- Snapshot 1 (read-write)
>
> 3. You create another snapshot -- all previous layers become read-only.
> Base image (normal VDI) (read-only)
> +-- Snapshot 1 (read-only)
> +---- Snapshot 2 (read-write)
>
> Write is performed only against latest layer, and only once.

the image the virtual machine sees is the union of all of the previous 
snapshots 
and base image, right?

How do you collapse all the snapshots and the base image into a new base image?

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