- The snapshot operation fails to complete.
- Unable to create a quiesced snapshot of the virtual machine.
- Unable to back up the virtual machine.
- Cloning a Windows 2008 R2 virtual machine fails.
- In the Application section of the Event Viewer in virtual machine, Windows guest operating system reports an VSS error similar to:
- Any process that creates a quiesced snapshot fails.
- You see the error:
Backup applications, such as VMware Data Recovery, fails.You see the error:
- Failed to create snapshot for vmname, error -3960 (cannot quiesce virtual machine)
- This is a known issue with VSS application snapshots which is not caused by VMware software. It affects ESXi/ESX 4.1 and later versions.
- Currently, there is no resolution.
- To work around this issue, disable VSS quiesced application-based snapshots and revert to file system quiesced snapshots. You can disable VSS applications quiescing with either the VMware vSphere Client or with VMware Tools. Use one of these procedures:
- Power off the virtual machine.
- Log in to the vCenter Server or the ESXi/ESX host through the vSphere Client.
- Right-click the virtual machine and click Edit settings.
- Click the Options tab.
- Navigate to Advanced > General > Configuration Parameters.
- Add or modify the row disk.EnableUUID with the value FALSE.
- Click OK to save.
- Click OK to exit.
- Reboot the virtual machine for changes to take in effect.
Alternatively, un-register the virtual machine from the vCenter Server inventory. To un-register, right-click the virtual machine and click Remove from Inventory.
Re-register the virtual machine back to the inventory.
Disable VSS application quiescing using VMware Tools:
- Open the C:\ProgramData\VMware\VMware Tools\Tools.conf file 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 and close the file.
- 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.
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