CD-ROM device is no longer accessible after installing the Hyper-V Linux Integration Services in a Red Hat or CentOS virtual machine

Article ID: 2600152 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:

· Red Hat or CentOS is installed in a Hyper-V virtual machine.

· The Linux Integration Services are installed in the virtual machine.

· After the Linux Integration Services are installed, the CD-ROM (/dev/cdrom) is no longer accessible in the virtual machine.

· If the Linux Integration Services are uninstalled, the CD-ROM is accessible in the virtual machine.

CAUSE

This issue occurs because the Hyper-V Linux Integration Services unloads the ata_piix driver in order to provide an optimized IDE driver (hv_blkvsc) for the root file system. To get access to the CD-ROM device, the Linux Integration Services must be uninstalled.

WORKAROUND

To work around this issue, mount the ISO in the virtual machine. To mount an ISO file in the virtual machine, the following command must be run before executing the mount command:

# insmod /lib/modules/$(uname -r)/kernel/drivers/ata/ata_piix.ko

Alternatively, copy the ISO file into the virtual machine and mount it using the -o loop option.

MORE INFORMATION

For more information about Hyper-V, visit the following Microsoft website: http://technet.microsoft.com/en-us/library/cc753637(WS.10).aspx

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.

Properties

Article ID: 2600152 - Last Review: August 18, 2011 - Revision: 2.0
APPLIES TO
  • Microsoft Hyper-V Server 2008
  • Microsoft Hyper-V Server 2008 R2
  • Microsoft Hyper-V Server 2008 Service Pack 2
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Service Pack 1
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 Service Pack 2
  • Windows Server 2008 Standard
Keywords: 
KB2600152

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