Ohh well, this has got to be the most annoying error when it comes to backing up your virtual machines. I have a complete Vmware 5.5 environment and every now and then there comes a virtual machine for which my netbackup application cannot quiesce the guest OS and the backup fails.
The main issue when this happens is with the volume shadow copy service as that is responsible for performing this action and due to some odd reason it is not able to do its job. Now after being frustrated for days this is what I have found which has fixed my issue, so give this a try and see if it helps you out.
UPDATE: Before you try the below steps try and vmotion the virtual machine to a different host and after that try and create a manual snapshot to test. If that continues to fail then you can try the below steps.
- Login to the guest vm and stop and disable the Vmware snapshot provider service
- Start the volume shadow service and make it automatic
- Start the virtual disk service and make it automatic
Retry the backup or even try the manual snapshot creating via your vsphere client with the quiescing option and see if it completes and if it does please leave a comment to this post!