Recently I noticed some Linux VM backups were failing and sometimes even crashing with following errors:
An error occurred while taking a snapshot: msg.snapshot.error-QUIESCINGERROR.
An error occurred while saving the snapshot: msg.snapshot.error-QUIESCINGERROR.
On closer look another error was visible in hostd.log file – Error when enabling the sync provider.
All of these VMs had one thing in common – they were running Docker containers.
I was not able to figure out why it happened but I was able to find a workaround – disable the VMWare Sync driver.
Copy-paste from Veritas KB article – https://www.veritas.com/support/en_US/article.000021419
Steps to Disable VMware vmsync driver
To prevent the vmsync driver from being called during the quiesce phase of a VMware snapshot, edit the VMware Tools configuration file as follows:
1) Open a console session to the Redhat Linux virtual machine.
2) Navigate to the /etc/vmware-tools directory
3) Using a text editor, modify the tools.conf file with the following entry
enableSyncDriver = false
Note: If the tools.conf file does not exist, create a new empty file and add the above parameters.