Hyper-V creates hidden Snapshots - Howto merge

First of all, is there a possibility to give information about a bug to microsoft without paying?
As I haven't found one (which would be really NOT customerfriendly) and I hope to help others I will post my problem and solution here.
Today our productive server which is a vm on a hyper-v host ran out of hdd space which was quite confusing for us as the assigned size of the disk is much less then the space the physical disk on the host has.
The hyper-v manager didn't show any snapshots. In the filesystem we saw a vhd AND a avhd file, the avhd file being the newer one and causing the error as it took all the space left on the disk.
We do NOT know where this avhd file comes from (maybe microsoft or some of you know how this could have happened?) but here comes the solution how I managed to merge the vhd and the avhd file.
I created another snapshot. So now I had two avhd files and one vhd file. Now I also saw at least the LAST snapshot in the hyper-v manager. I deleted this last snapshot in the hyper-v-manager (DO NOT DELETE THE AVHD FILE IN THE FILESYSTEM!) and started merging
the snapshot and the vhd. In this merging process also the hidden snapshot is merged and both avhd files dissappear and diskspace is free again.
Reserve some time for the merging process - it took me about one hour.
I'm quite alarmed about that now as we are just bying a new server and wanted to use hyper-v again. Would be really helpful to know where this hidden snapshots come from and how to avoid them so we can decide if we should stick to our decision to use hyper-v.
Also I feel very unhappy with the fact that there iseems to be no possibility to contact microsoft without paying even if there seems to be a bug in their OS.
Best regards,
Tina

Hi Tina, There are a few possibilities here. The Virtual Server could have been moved from a previous Version of Hyper-v, leaving the AVHD file inplace, this wouldn't show up in the new hyper-V console.
Or some backup solutions create independent snapshots, which are using to backup online Virtual servers
Have you moved your Virtual Servers recently to new hardware ? you don't mention what version of Server your are using 2012 ? 2008R2 , 2012R2 ?.
Also if you delete a snapshot on 2008R2, the snapshot can stay there until you power off the virtual server. at which point it then automatically merges back into the original VHD.
When you delete a snapshot, the .avhd files that store the snapshot data remain in the storage location until the virtual machine is shut down, turned off, or put into a saved state. As a result, when you delete a snapshot, you will need to put
the production virtual machine into one of those states at some point to be able to complete the safe removal of the snapshot.
http://technet.microsoft.com/en-us/library/dd560637(WS.10).aspx
thanks
Mark

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