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Can I Convert Dynamic to Differencing?

Posted on 2011-02-17
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Hi Folks--
I just finished creating a new VM with a 60 gb virtual drive. I got the OS installed, networking configured, got MS updates on, activated the lic and put the machine on my domain. When I went to create a folder off the Root I noticed there was only 3+gb left on the C, which was configged for 15gb at the beginning of the OS install. OK....but where was the 2nd partition of 45 gb of unallocated space??

I shut the VM off, went into settings for the .vhd file and found that it was indeed 60gb BUT that I'd created a Dynamically Expanding disk rather than the Differencing Disk that I normally do. I don't recall choosing the Dynamic type...

So I need to make it a Differencing Disk but it doesn't seem to be an option...I can Compact it, Expand it or convert it to a Fixed Disk...but not convert it to a Differencing Disk.

It looks to me like I have to delete the disk and start over with the VM...is that true? Do I have any other oprtions?

Thanks for your time...Tom
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Question by:TLauranzano
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Svet Paperov earned 2000 total points
ID: 34925917
Hi,

I am sorry but there is no way to convert an existing VHD (dynamically expanding or fixed) into a differential. To use a differential disk you need a parent disk from which you start your new disk.

However, I think you did good with this disk. Using differential disks in production environment is a bad idea. If your parent disk fails you lose everything (all differential disks connected to the parent). If the link between the parent and differential disk fails, it is a nightmare to restore it. Also, the differential disks are far slower than the dynamically expanding or fixed disks.

So, my suggestion, stick with dynamically expanding disks and find a way to add more physical disk space. The price of disks these days doesn’t justify the risks you are taking of using differential disks. Differential disks should be used only in lap or development environment where you need to make multiple copies of the same basic configuration.

I hope this helps
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