Hyper-V VSA Bug

NCoppersmith — Mon, 12 Dec 2011 19:40:54 GMT

I've been playing around in my lab with the VSA for Hyper-V prior to rolling it into production. I've discovered a rather evil bug that I wanted to see if someone else could replicate. I can duplicate this problem non-stop, so it's either my particular configuration, or I'm doing something wrong.

Brand new, Windows Server 2008 R2 SP1. Create a basic VM just to verify it all works. (it does)

Install VSA for Hyper-V.

If the VSA installation fails for any reason, it will delete the entire Hyper-V folder out of C:\programdata\microsoft\windows (the default hyper-v installation folder). I've had this happen at least 5 or 6 times now, the latest was because I tried to create a VHD to a path that didn't exist. Thankfully, after the previous time I got wise and backed up the Hyper-V folder before running the VSA installation, so all I had to do was copy it back.

This is kind of nasty though, if it's not just me I can imagine the wailing and gnashing of teeth that would occur in a production environment.

Also, can we make the install smarter so if the path doesn't exist during installation it gets created? Minor detail I know, but I can't remember the last time software installation would die instead of creating a path that was specified but didn't exist.

(note: all this was done on the machine itself, logged in as a local administrator)

Re: Hyper-V VSA Bug

NCoppersmith — Mon, 12 Dec 2011 19:51:01 GMT

Actually it looks like it deletes whatever folder you install to if it fails. I had a folder called C:\Hyper-V with a single VM created inside of it and after it failed it removed the entire C:\Hyper-V folder. (doesn't go into the recycle bin either)

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Hyper-V VSA Bug

Re: Hyper-V VSA Bug