Are you wanting to P2V a machine but you don’t want to migrate your whole 2TB hard drive into your datastore? Most people tell you to just convert your machine using Thin provisioning. Although you can do that, there is another way if you don’t want to worry about the over-allocation.
The idea is to shrink the size of your hard drive’s volumes BEFORE you convert your machine. I have a few 256GB Samsung 840 Pro’s in my Synology 412+ NAS which means every megabyte is valuable. If you have a large hard drive but are only using a small portion of the drive, your best bet is to do the following (**Note** This will only work on Windows 7 and 2008. Windows Server 2003 can be shrunk using 3rd-party software) :
- Go to ‘Administrative Tools’
- Select ‘Computer Management’
- Select ‘Disk Management’
- Right-Click the large volume and select ‘Shrink Volume’
- Choose the amount you want to shrink your volume by (in MB)
- Click ‘Shrink’
After you shrink your volume, you can go ahead and run the Converter. You will see that the converter shows the newly-sized volume. You can still convert this to a Thin disk, but you won’t have to worry about an extreme over-allocation compared to what you previously had. Your migration will also take considerably less time.