Multiple GPT Pass Through Disks are not support in System Center Virtual Machine Manager 2008 R2


When using System Center Virtual Machine Manager 2008 R2, a Virtual Machine (VM) 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): 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)

BusSlotIsBusy (659)


The 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 does not 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. 


Using the 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 Information

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 System Center Virtual Machine Manager 2008 R2 hotfix rollup package: June 8, 2010;en-US;982522

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2505398 - Last Review: 02/10/2011 19:55:00 - Revision: 7.0

Microsoft System Center Virtual Machine Manager 2008 R2 Workgroup Edition

  • KB2505398