Migrating a Windows Home Server guest machine from VMWare Virtual Server 2.x to Hyper-V

I was running a Windows Home Server under VMWare Virtual Server as a guest machine. It had a dedicated 750GB hard disk to host a fixed size virtual disk spanning entire hard disk.

These days I am migrating this and other virtual machine to the Hyper-V 2008 R2 free server and here is how I did migrate it.

  1. Uninstall Virtual Server Tools from guest machine (this is important at this point in time because later it can’t be done easily through add/remove programs).
  2. Shut down guest.
  3. Copy all VMDK files to a spare (new) 1.5 TB Seagate disk. This step isn’t strictly necessary but it was for me because the source disk had troubles reading some sectors – if I wanted to proceed I had to have all the files on a good disk. This step took something like 4 hours over 1Gb LAN.
  4. Download and run VMDK to VHD Converter.
  5. Convert VMDK files (as input select the one without numbers if your virtual disk is partitioned across many files, i.e. SomeDisk.vmdk). I converted to the same hard disk (it barely fits) and it took something like 7 hours.
  6. Copy the resulting VHD to the Hyper-V server (I could pick the server as target location in step 5. but I felt more comfortable doing conversion locally). This step again took something like 4 hours.
  7. Create a new Virtual Machine on Hyper-V server, attach the resulting VHD file as its disk.
  8. Run the machine, activate OS (it will detect “huge” hardware change and it will require activation).
  9. Install Integration Services (Action/Insert Integration Services Setup Disk on connection window) and that’s it.

Lessons learned:

  • Hard disks are growing fast in size but network speed doesn’t. Thus such transfers will be slower and slower due to the sheer amount of data to transfer between disks.
  • Such operation might take whole day
  • If you use an external disk like I am then you should really stick with e-Sata instead of USB 2 or firmware (it is up to 4x faster)
  • Have enough free space on hard disks
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