Just a quick FYI on a new SCVMM 2008 R2 Knowledge Base article we published today:
You are using Hyper-V and a Failover Cluster and your Virtual Machines (VMs) share the same Clustered LUN to hold the VHD for the VMs. You are also using System Center Virtual Machine Manager 2008 R2 (SCVMM) to manage your environment. If you delete a VM that resides on a LUN which is shared with another VM, the other VM may fail.
This is by design. System Center Virtual Machine Manager was not designed to allow management of this shared configuration. Sharing a LUN across multiple Virtual Machines is an unsupported configuration and may lead to undesirable effects.
This problem does not occur if you are using Clustered Shared Volumes (CSV).
This issue only affects System Center Virtual Machine Manager 2008 R2.
For the latest version of this article see the following: