Multiattach drive

[thelemanu]

Hi,
I am struggling to do something which I thought simple.
On a Windows 7 PC, building Windows 2K3/2K8 VM.
I want to create
A master VM to get a master disk which I can transform to a multiattach disk, in order to build multiple VMs based on that disk
So my steps:
Create a "master" VM, install OS and application, create snapshot1
Sysprep the VM, create snapshot2
Clone snapshot2 to master-w2kx.vdi
Change master-w2kx.vdi to multiattach
Then create new VM, using the master-w2k.vdi as base disk.

1. Is this scenario and process valid
2. will the new VM created from master-w2kx.vdi keep the changes, in differencing files

I have tried that and got errors when creating the VM from the master-w2k.vdi. It could not create the VM.
Then when retrying with another new VM, the disk is not multiattached, but has been change to Normal.

I am doing something wrong, but can't see what exactly.
Can somebody details the process to obtain a master disk that can be used as a "multiattach" disk to create multiple VM from?

Thanks
Emmanuel

[7layerlogic]

I'm in the same boat as you. I tried making the VM, shutting it down, cloning the disk, converting it to type "multiattach". When building the new VM it shows the cloned/changed drive as "multiattach" and all new VMs will create a differencing disk. The problem is, as soon as I click continue, the system locks up and I have to restart Virtualbox. At that time the new VM appears in the GUI, however it changed the "multiattach" VDI to "normal" and then after deleting the VM it will not let me change the type. To re-create scenario I have to clone another copy of the original VDI.

I know this doesn't help, but it is another way to do what you are proposing, but fails.

If you found a way to make this work, please share.

Thanks

Shawn

[thelemanu]

Hi, Anybody with an answer/suggestion/explanation to that problem?