Hyper-V Snapshot deletion and merging, does the VM need to be shutdown or restarted?

With Server 2012 Hypervisor, being managed by Server 2012 running Hyper-v Manager.  When you delete the snapshot, it says that it is merging.  Is it actually merging the delta or, do you need to restart the VM for this to happen?

Thanks.
CnicNVAsked:
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Tyler BrooksNetwork and Security ConsultantCommented:
It doesn't need to be shutdown to merge, I have done this several times while the server is up and never had an issue. It sometimes takes quite a while though depending on the server.
Raheman M. AbdulSenior Infrastructure Support Analyst & Systems DeveloperCommented:
Nothing to worry about the merging message. It merges the AVHDs with the chain when the snapshot with dependent snapshots is attempted to delete and the VM is not in a running state.

For more clarity refer point 2 in:
Refer: http://blogs.msdn.com/b/virtual_pc_guy/archive/2009/04/15/what-happens-when-i-delete-a-snapshot-hyper-v.aspx

Especially the point: "AVHD merging can only happen when the virtual machine is not running – so the AVHD will remain while the virtual machine continues to run but will be merged as soon as the virtual machine stops"

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CnicNVAuthor Commented:
This is good, I remember looking at the server HD LEDs a few days after I had deleted the snap shot chains on a few of our VMs and they were still blinking like mad, anecdotally having me wonder why there was still a lot of IO on those disks.  I suspected that the HD delta's may have not been deleted.  I checked and there are some remaining AVHDs for those VMs.  So I will have to restart those VMs to get them cleared off.

Thanks again for this information.
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