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How to create multiple levels of differencing disks (3.2.8)

Posted: 6. Sep 2010, 18:00
by moiztankiwala
I want to create 2 levels of difference disk (Parent -> Child_1 -> Child_2).

I am able to create Child_1 easily by following the steps below:
1. Create a parent as a dynamically expanding disk at the time of creation of the VM.
2. After my OS has been installed, I make the parent disk immutable and mark the file readonly.
3. In the Virtual Box GUI, I mark the differencing disk checkbox and virtual box creates a differencing disk. (I cannot follow a similar procedure to create the second child here).
4. I mark the "autoreset" to off from the command line on Child_1.

My question is, how to go about creating the Child_2 disk that has its parent as Child_1?

Thanks in advance for looking up my questions.

Regards,
Moiz Tankiwala