RHEVM : VM no longer bootable after snapshot removal

Hi Everybody

Just been hit by a rather nasty problem.  I'm kinda hoping that we're doing something wrong because I fear that if what we have found is a bug, then we may have a big problems.  If you wish to reproduce this issue then please do NOT do so on a VM that is important to you, as it has the potential to trash it.

Version : RHEV 3.1.0-50

Issue: VM is no longer bootable after snapshot removal. VM reports "Boot failed. Could not read the bootdisk. No bootable device"

Reproducable:  Yes- Everytime

VM type:   RHEL5/6 built on PreAllocated disk

Steps to reproduce (don't do this on a VM that you want !)

1.  Via the webadmin tool, take a "live" snapshot of a VM.   ("live" = with VM power up)

2. Make some changes to some files on you VM to prove the snap process

3. Power off your VM

4. Via the webadmin tool, remove the snapshot you created in step 1.   Wait for confirmation of snap removal

5. Power on your VM and start console session

Console reports errors and VM fails to boot.

This problem is reproducable on all of our RHEV3.1.0-50 environments, but works fine on our RHEV3.0.7 environment (albeit not a "live" snapshot)

Support case raised.