Archive for category Hyper-V

Adding existing Hyper-V cluster to VMM 2012 R2


I have just stumbled across an article in regards to moving Hyper-V cluster with production  load to a VMM 2012/2012 R2 environment.

VMM will (as part of adding the new cluster) add MIPO device list to each of the hosts participating in the cluster, which would cause a loss of connectivity to storage.

Edit: After doing a bit of investigation to MPIO, things to bare in mind:

  1. if you are adding an existing Hyper-V cluster to VMM and one or more of your hosts failed to join, drain one of those ‘Pending’ nodes and work on it separately. This would avoid any impact on production load.
  2. Remove any MPIO settings under Control Panel -MPIO as shown below: (Don’t reboot).

mpio1    3. Try adding the Hyper-V host to VMM.

You could query connected SAN (using mpclaim -e) and display it as vendor-product id strings which you could add via the MPIO GUI.


As you can see there are spaces added to the end of the string to make it compatible. This is necessary, and adding to VMM would fail otherwise.


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Could not get VHD GUID – Live Migration


We have recently started going through a major project of migrating Hyper-V VM’s in bulk from one cluster to another (same processor family) using “Shared Nothing Live Migration”. The issues we started having when two VM’s share the same .vhdx disk name moving to the same  Hpyer-V host, you would receive similar error to the one below:


There are two ways to resolve this:

  1. Move to a different CSV location.
  2. Move to the same location under a new folder structure.


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