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Hyper-V Host Reports a Virtual Storage Device Error With Pass-through Disk

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Symptoms

Consider the following scenario:

You are hosting a Virtual Machine configured with a SCSI attached Pass-through disk from a Windows Server 2008 R2 Hyper-V Host.

You attempt to monitor the performance of the Pass-through disk from the host OS using the following Performance Monitor Counter:

Hyper-V Virtual Storage Device\Error Count

You observe that the Error Count increases when the guest is booted or the guest is running.

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Cause

This behavior occurs because the guest OS sends a SCSI command which is not supported by Hyper-V in this scenario. As a result, the host OS increments the Error Count performance counter. This is expected behavior but it is an unnecessary increment and no corrective action is required.

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Resolution

When the virtual machine is using a Pass-through disk, you should monitor the performance of the Pass-through disk from within the guest OS.

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Keywords: kb

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Article Info
Article ID : 2624495
Revision : 1
Created on : 1/7/2017
Published on : 10/5/2011
Exists online : False
Views : 473