One of the common reasons for this error message is incorrectly deleting a VM snapshot, which can leave VMDK files related to snapshots and log files on the datastore (for example, after you performed the Delete All or Delete operation for VM snapshots).
The VMware virtual machine disks consolidation is needed error message is displayed in the VM Summary tab in the VMware vSphere Client (screenshot below). Possible Reasons for the VMware Disk Consolidation Error Remember that VMware recommends using no more than 32 snapshots per VM. Storage space is cleaned after you consolidate virtual machine disk files. When you perform VMware disk consolidation, data from delta disks is merged to a single disk, and no redundant data is left on the datastore where this VM’s files are located. 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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