'Consolidate' and 'Delete' terms still confuse many of my fellow experienced IT Professionals.
Let me try to explain the difference in simple words:
Consolidate option was made available from VSphere 5.x onwards and prior to which we had only 'Delete' snapshots option.
Consolidation searches for hierarchies or delta disks to combine without violating data dependency i.e deletes all the redundant 'redo' logs which saves space in datastore and increases VM performance. This operation 'does not' delete the snapshots!
Delete / Delete All will actually delete the snapshots and changes present of the delta disks will be written back to the parent disk (flat.vmdk).
Please think twice before deleting the snapshots as it require space to be available in datastore. Make sure you have
'snapshot size(delta file) + its parent disk size' space free in datastore, atleast.
Snapshot deletion process and space requirement in datastore is explained in my next post.
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