Were you ever able to resolve this issue? We are experiencing the same situation. However, we have it happening to 9vm's, with a mix of 2008r2, and 2012r2 machines. Acronis support has not been able to figure out what is causing the issue. One caveat to our's is everything worked fine while we were on a trial license. The issue came up when we moved to our commercial license.
To get past this issue, from memory we installed the vsphere update manager and then notices some vsphere updates were to do with quiesce snapshot issues. Updating vpshere was the resolution to our particular problem of not being able to do backups.
Issue: Unable to backup vm due to following warnings:-
Warning: Virtual machine consolidation needed status
Warning: feature requirements of this virtual machine exceed capabilities hosts current EVC mode
error: Failed to revert execution state of Virtual Machne to snapshot Before massive creation of small WCM content items, with ID 1944
Web client error console: No error here that relates to the issue
Infrastructure: ESXi vpshere 6.0 (vsphere essentials)
Issue first noticed: within last 2 weeks, have not seen prior (nothing to do with our migration)
VMware tools: Current
OS: Microsoft Windows Server 2008 R2
Number vms in cluster:286
Problem vms: 1
We have recently upgraded to vsphere 6.0 and had to migrate a lot of vms including this problematic one.
The issue was noticed when an acronis backup failed due to failure to quiesce error
We have tried migrating it again since and cleaning up file and folder names to resolve
consolidation does not fix the issue and still fails to quiesce snapshot with above warning
It is likely that the user has deleted a few snapshots and there are a lot of snapshots
It is interesting also that when I go back through the snapshots in web client the preview image appears broken
Any thoughts/suggestions appreciated