When you perform a backup it runs for some time and can even look that it is close to completing and then the backup fails with "Error Message: The database trasaction was rolled back".
We have found that this issue is caused by the VMware tools showing as running but not being supported. This happens when a host is upgraded to a newer version but the VMware tools on the VM are not touched.
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The following will be shown in the the vSphere client under the summary tab for the VM having a backup issue.
To resolve the issue please upgrade or reinstall the VMware tools for the VM that is having this issue. Once the tools show up as running and
You will also want to clean up the repository storage via windows explorer because upon job failure a VM directory is created on the repository storage and the folder contains the savepoint.manifest and VMconfig files. Because vRanger does not know about these files the folder and files will not be cleaned up by vRanger and will need to be cleaned up manually. The files should not cause an issue with the free space on the storage because they are small but can cause confusion in the future as to why they are there.
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If this KB does not help resolve your issue these additional KBs can also help.
https://support.quest.com/SolutionDetail.aspx?id=SOL95336
https://support.quest.com/SolutionDetail.aspx?id=SOL95337
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