VM backups fail with status 156
I am seeing certain virtual machines fail their VM backup with a status 156 snapshot error. I have several backup policies configured in the same way, and 99% work without any issues. But I have one policy where 2 clients fail with a 156 error. All my VM VADP policies are configured to backup by VM folder name. And snapshot client options are set as "client name selection = VM display name".
The policy in question is configured exactly the same, and the display names for the 2 clients contain VMware and Netbackup allowed ASCII characters. The policy also has the "virtual machine quiesce" option set to disabled. Both VM clients have VMware tools installed.
I have checked the bpfis logs on my VADP media server, and cannot see anything that highlights a problem.
My environment is Windows 2008 R2 / NBU 7.1.0.2 and ESX 5.0.
Thought I'd post here to see if anyone has any ideas, before I open a support case.
Thanks.