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

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

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KBWhen 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):

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)
BusSlotIsBusy (659)

Cause

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.

Resolution

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
http://support.microsoft.com/default.aspx?scid=kb;en-US;982522

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For the latest version of this article see the link below:

KB2505398 - Multiple GPT Pass Through Disks are not support in System Center Virtual Machine Manager 2008 R2

J.C. Hornbeck | System Center Knowledge Engineer

The App-V Team blog: http://blogs.technet.com/appv/
The WSUS Support Team blog: http://blogs.technet.com/sus/
The SCMDM Support Team blog: http://blogs.technet.com/mdm/
The ConfigMgr Support Team blog: http://blogs.technet.com/configurationmgr/
The SCOM 2007 Support Team blog: http://blogs.technet.com/operationsmgr/
The SCVMM Team blog: http://blogs.technet.com/scvmm/
The MED-V Team blog: http://blogs.technet.com/medv/
The DPM Team blog: http://blogs.technet.com/dpm/
The OOB Support Team blog: http://blogs.technet.com/oob/
The Opalis Team blog: http://blogs.technet.com/opalis

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  • How is this a resolution? It's not, its not even a workaround. When will it be fixed with an actual resolution?

  • The steps resolve/workaround the issue as described above. As far as when support for multiple GPTs wil be added, I honestly don't know what the timeline is.  As soon as I get word of a date I'll be sure to post an update here.