The warning 'Virtual Machine disks consolidation is needed' in the Summary tab of a virtual machine in the VMware vSphere console means that when deleting a snapshot (using the option Delete or Delete All), the snapshot VMDK files or logs have not been deleted correctly (remain on the storage).
If you get the "Virtual Disk Consolidation needed" message, go to the Snapshot menu and click "Consolidate" it should run correctly now and remove the message.
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