The presence of redundant delta disks can adversely affect virtual machine performance. You can combine such disks without violating a data dependency. After consolidation, redundant disks are removed, which improves virtual machine performance and saves storage space.

Snapshot consolidation is useful when snapshot disks fail to compress after a Delete or Delete all operation or if the disk did not consolidate. This might happen, for example, if you delete a snapshot but its associated disk does not commit back to the base disk.

The Needs Consolidation column in the vSphere Web Client shows the virtual machines to consolidate.

Required privilege: Virtual machine.State.Remove Snapshot


Show the Needs Consolidation column.


Select a vCenter Server instance, a host, or a cluster and click the Manage tab and click Virtual Machines.


Right-click the menu bar for any virtual machine column and select Show/Hide Columns > Needs Consolidation.

A Yes status indicates that the snapshot files for the virtual machine should be consolidated, and that the virtual machine's Tasks and Events tab shows a configuration problem. A No status indicates that the files are OK.


To consolidate the files, right-click the virtual machine and select All vCenter Actions > Consolidate.


Check the Needs Consolidation column to verify that the task succeeded.

If the task succeeded, a No value appears in the Needs Consolidation column.


If the task failed, check the event log for failed conditions, such as running out of disk space.


Correct the error, and retry the consolidation task.

The configuration problem is resolved, and the Needs Consolidation value is No.