I have several VMs (VMWare) and VPCs (MS VPC), and one of them in particular has been performing worse and worse, so I thought it could be good to defragment it.
Now there’s internal fragmentation and there’s external fragmentation (just like indexes in SQL Server :P). The internal fragmentation is handled using the windows defragmentation tool inside the VM or VPC. External fragmentation occurs if you have set your disks to grow incrementally as needed. You could also say that all the space for your virtual disks should be reserved, and if your physical disks were defragmented in the first place, there would be no external fragmentation of your virtual disks. But if you let them grow incrementally, or your physical disk was fragmented when you created the virtual disk, there might be some fragmentation.
So I found this excellent tool from Sysinternals: http://technet.microsoft.com/nb-no/sysinternals/bb897428(en-us).aspx
Now I don’t need to defragment the whole physical disk. I can just defragment one file at a time. Should save me some time :)
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