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Article ID: 2525103 - Last Review: May 2, 2011 - Revision: 5.0


When you attach a GPT pass-through disk provided from SAS storage (Serial attached SCSI) array to a highly available virtual machine by using the Hyper-V Manager or Failover Cluster Management Microsoft Management Console (MMC) snap-in, the System Center Virtual Machine Manager 2008 Admin Console lists the status of the virtual machine as "Unsupported Cluster Configuration."

Details on the High Availability section of the VMs Properties in SCVMM are:

Highly available virtual machine <Machinename> is not supported by VMM because the VM uses non-clustered storage. Ensure that all of the files and pass-through disks belonging to the VM reside on highly available storage.


GPT pass-through disk provided from SAS storage array is not supported in System Center Virtual Machine Manager 2008 R2. 

This limitation only applies if the pass through disk provided from a SAS storage array in a clustered environment is GPT. There are two workarounds for this:
1. Add the LUN from the SAS storage to the cluster, create a CSV and place the VHDs on it and attach those to the VM.
2. Create MBR pass through disks and attach those to the VM. Note that both VHD and MBR pass through disks are limited to 2TB in size.

This will be fixed in the next version of SCVMM.

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.

  • Microsoft System Center Virtual Machine Manager 2008 R2 Workgroup Edition
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