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Cannot take a quiesced snapshot of Windows 2008 R2 virtual machine (1031298)
- The snapshot operation fails to complete.
- You are unable to create a quiesced snapshot of the virtual machine.
- You are unable to back up the virtual machine.
- Cloning a Windows 2008 R2 virtual machine fails.
- The Application section of the Event Viewer in the virtual machine Windows guest operating system may report a VSS error similar to:
Volume Shadow Copy Service error: Unexpected error calling routine IOCTL_DISK_SET_SNAPSHOT_INFO(\\.\PHYSICALDRIVE1) fails with winerror 1168. hr = 0x80070490, Element not found.
- Performing any process that creates a quiesced snapshot fails.
- You see the error:
Can not create a quiesced snapshot because the create snapshot operation exceeded the time limit for holding off I/O in the frozen virtual machine.
- Backup applications, such as VMware Data Recovery, fail with the error:
Failed to create snapshot for <vmname>, error -3960 (cannot quiesce virtual machine)
This issue occurs due to a known issue with VSS application snapshots and ESXi/ESX 4.1 and later.
To work around this issue, disable VSS application-based snapshots and revert back to file system quiesced snapshots.
- Some issues related to Windows 2008 R2 VSS application-based snapshot backups in vSphere Data Protection (VDP) have been resolved in VDP 5.1.10. For more information, see the vSphere Data Protection 5.1.10 Release Notes.
- For related information, see Troubleshooting Volume Shadow Copy (VSS) quiesce related issues (1007696) and Disabling specific VSS writers with VMware Tools (1031200).
Option 1 - Disable VSS application quiescing using the vSphere Client:
- Power off the virtual machine.
- Log into vCenter Server or the ESXi/ESX host through the vSphere Client.
- Right-click the virtual machine and click Edit settings.
- Click the Options tab.
- Go to Advanced > General > Configuration Parameters.
- Add or modify the row
disk.EnableUUIDwith the value
- Click OK to save.
- Click OK to exit.
- To make this change take effect when using the vSphere Client, reboot the virtual machine.
Note: If this change is done via the command line, using the
vim-cmdcommand and powering on the virtual machine is enough to see the changes. For more information, see Reloading a vmx file without removing the Virtual machine from inventory (1026043).
- You can also optionally unregister the virtual machine from the vCenter Server inventory. To unregister, right-click the virtual machine and click Remove from Inventory.
- Register the virtual machine. For more information, see Registering or adding a virtual machine to the inventory on vCenter Server or on an ESXi/ESX host (1006160).
- Power on the virtual machine.
disk.EnableUUIDparameter for VMware Data Protection (VDP), see the Resolution section in Backing up a Windows Server 2008 R2 virtual machine using VMware Data Protection 5.1 fails with the error: Execution Error: E10055:Failed to attach disk. (2035736).
Option 2 - Disable VSS application quiescing using VMware Tools:
- Open the
C:\ProgramData\VMware\VMware Tools\Tools.conffile in a text editor, such as Notepad. If the file does not exist, create it.
- Add these lines to the file:
vss.disableAppQuiescing = true
- Save the file and exit the editor.
- Restart the VMware Tools Service for the changes to take effect. Click Start > Run, type
services.msc, and click OK.
- Right-click the VMware Tools Service and click Restart.
- For information on quiesced snapshots in VMware Consolidated Backup (VCB), see the Virtual Machine Backup Guide.
- For information on quiesced snapshots in VMware Data Recovery (VDR), see the VMware Data Recovery Administration Guide.
- There is a related known issue with vCenter Server installed on a Windows 2008 or 2008 R2 virtual machine with snapshots and the ADAM or NTDS instance which are used by vCenter Server:
This issue is resolved in ESXi/ESX 4.1 Update 1. For more information, see the Backup section of the VMware ESX 4.1 Update 1 Release Notes.
- In some cases, Windows 2008 R2 patches may update the Microsoft VSS drivers. If this occurs, reinstall VMware Tools so that the VMware VSS drivers can be used again.
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