To resolve this issue, turn off the snapshots consolidation enhancement in ESXi 5.5, so that it works like earlier versions of ESX/ESXi.
This can be done by setting the snapshot.asyncConsolidate.forceSync to TRUE.
Note: If the parameter is set to true, the virtual machine may not respond to ping during the consolidation.
To set the parameter snapshot.asyncConsolidate.forceSync to TRUE:
- Right-click the virtual machine and click Edit settings.
- Select the Options tab.
- Under Advanced, right-click General and then click Add Row.
- In the left pane, add this parameter: snapshot.asyncConsolidate.forceSync
- In the right pane, add this value: TRUE