When the chain of snapshots and related virtual disk files becomes large, performance degrades. As a result, redundant data is present in the virtual machine storage because each delta disk contains all changes made as compared to the previous delta disk state, and the parent disk remains unchanged.
When you take a snapshot, delta disks are created and changes are written to the appropriate delta disk (the latest delta disk by default, until one of the previous snapshots is selected to restore the virtual machine).
You can initiate disk consolidation on demand to avoid performance degradation and other issues. Virtual disk consolidation is the process of merging virtual disk files created after taking VM snapshots. This blog post explains why VMware virtual machine disks consolidation is needed and how this error can be fixed. Sometimes the virtual machine consolidation needed status is displayed in the VMware vSphere Client, and a system administrator has to fix this error. They work reliably with high performance if the appropriate hardware is used and the right software configuration is applied. Virtual machines in VMware vSphere have many advantages.
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