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mnemosyn
Asked: 2010-05-09 08:26:29 +0800 CST

Hyper-V Virtual Disk Creation Taking Forver

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After some struggle, I finally managed to set up Hyper-V 2008 R2 on our server. So I connected to it using the Hyper-V Manager from a Windows 7 client and used the "New Virtual Machine Wizard". I set up a 350GB virtual hard disk.

So I hit the "finish" button and the Hyper-V manager has been working for > 24hours now, showing merely a dialog "Creating Disk". A console on the Hyper-V still reports 99.9% free space on the HD, but the machines HD LED flashes from time to time (making a rather idle impression, it's not flashing frenetically).

Does this usually take this long? Is there a way to find out whether it's still working or just idling? Should I repeat the process? Guides on the net tell me to be patient, but >1d seems a bit extreme!?

hyper-v vhd virtual-disk

4 Answers

  1. Best Answer

    The "New Virtual Machine Wizard" sets up dynamically expanding disks by default. Setting up a dynamically expanding disk takes no more than a second, which is what I found after aborting the process and rebooting both client and server.

    I haven't tried setting up a fixed disk, but I doubt it takes 1h for 0.5GB - that'd make it totally worthless because setup times would be in the range of several months. Did you mean 0.5TB, Chris S?

    It seems the Hyper-V manager that ran for days was simply hanging. In general, the Hyper-V Manager is an extremely unstable piece of software, often leaving (modal) dialogs open that cannot be closed by any means other than killing mmc.exe.

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  2. s the storage directly attached to the server? I had cases where I had storage to create fixed size vhd's on either a NAS or a SAN, and in particular on NAS (which had a non-windows native OS) it took very looooong as well. I always waited, and usually the process always finished succesfully.

    Good luck!

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  3. I used VhdTool to quickly create a virtual disk of the correct size and then just used Hyper-V to create the machine and reference the blank VHD file. From there you can insert your OS installation media and start the machine. This was a lot faster than the seemingly never ending "Creating disk..." method that Hyper-V offers.

    You can download the tool and get instructions here: http://archive.msdn.microsoft.com/vhdtool

    e.g. at the cmd prompt: VhdTool.exe /create "Clean10Gb.vhd" 10737418240

    They do say only to do it with servers you trust because there is a security implication in not zeroing out all the underlying data on the hard drive.

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  4. Ok, I see this issue if you try it from non-domain HyperV host --> Creating VM on Domain HyperV host (with using the storage on domain host). Once I tried same steps going from 1 host and using it's own storage creation took seconds. Possible solution: use hyperv manager of that host, where you want to place the VM on.

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