Delete Delta Vmdk Files

If you have many VMs with delta VMDK files to delete, you can use PowerCLI (a PowerShell-based command-line interface for VMware) to automate the process. Here's an example script:

# Disconnect from vCenter server Disconnect-VIServer delete delta vmdk files

The VM must perform a "lookup" operation every time it reads or writes data. If the VM needs data that is on the base disk, the delta file is checked first, and then the request is passed to the base disk. This overhead increases latency and decreases I/O performance. If you have many VMs with delta VMDK

From that moment on, every write operation the VM performs is directed to this delta file, not the original base disk. the delta file is checked first