When using System Center Virtual Machine Manager 2008 R2, a Virtual Machine will report an unsupported state after adding multiple GUID Partition Table (GPT) disks. The status changes to 'Unsupported VM Configuration' or 'Unsupported Cluster Configuration' depending on whether the VM is running on a standalone server or on Failover Cluster nodes.
SCVMM traces report the following errors (The SCSI ID number could be a different value):
VM.contoso.com has an invalid bus specification or bad path or path that we cannot access and will be marked unsupported
Another device is already at the location (SCSI; 0; 1)
Cause: SCVMM cumulative rollup released June 8, 2010, allows GPT disks to be recognized and used by VMs. This also applies to pass through type GPT disks. This update doesn't allow, however, for multiple GPT disks per VM. A single GPT disk of VHD or pass through disk format is supported, but once more than one is added to a VM status will change to unsupported.
Resolution: Using Hyper-V Management Console, remove all but one GPT disks from the unsupported VM. Following a refresh in SCVMM the virtual machine will once again appear as healthy and can be managed once again.
Converting GPT disks to MBR is a workaround to this issue.
More Info: This update addresses functionality with SCVMM 2008 R2 only. Previous versions cannot use GPT disks. All SCVMM rollups following that release in June also include this GPT update. Description of the SCVMM 2008 R2 hotfix rollup package: June 8, 2010.
For the latest version: KB2505398 - Multiple GPT Pass Through Disks arent support in SSCVMM 2008 R2
[tags]vmm 2008 r2,virtual machine manager 2008 r2,scvmm 2008 r3[/tags]