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?

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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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