To consolidate the snapshot, right-click the virtual machine and choose Snapshot – Consolidate. That is, the disk state will be independent of the snapshot state creating, consolidating, or reverting to snapshots will have no effect on the disk. Note: An independent disk does not participate in virtual machine snapshots. In the vCenter server on the Virtual Machines tab you can enable the field “Needs Consolidation” to filter all the VMs that needs consolidation. VMware Cloud on AWS supports three virtual disk modes: Independent persistent, Independent nonpersistent, and Dependent. The snapshot manager shows no snapshots but there are delta files present on the datastore(s). In vSphere 5 you get a warning ‘ Virtual machine disks consolidation is needed’ when the virtual machine snapshot consolidation has failed.
In vSphere 5 you have a new feature that reports and make it possible to consolidate these ‘hidden’ snapshot(s). I moved it to another host and tried the same steps, but I still have the 'Virtual machine disks consolidation is needed.' alert on the VM. I right click on the VM, Snapshots -> Consolidate. I delete all snapshots, and the alert is still there. To report these ‘hidden’ snapshots (prior vSphere 5), I created a script that searches all the datastores for ‘*.delta’ files and reported them by mail. I click Consolidate and it runs, but the blue information alert is still there. These ‘hidden’ snapshot can cause the datastore to run out of space. When a snapshot didn’t commit properly, it can happen that the snapshot manager in the vCenter server shows no snapshot(s), but that there are still active delta files on the datastore.
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