Once a VM is created, you may find that you wish to alter the storage policy of the VM or one of its disks. This will typically be the result of the performance or availability requirements of a VM changing over time. For example, you may have a database or and e-mail server where you want the high-access data disks to be striped across physical spindles to help improve performance.
If changes need to be made, changes can be granularly applied to individual objects comprising the VM or to all components for the VM.
You should be logged into vSphere Web Client as an administrator or a user authorized to modify VMs.
In vSphere Web Client, navigate to Home | Hosts and Clusters | Datacenter | Cluster.
Once the VM is selected, navigate to Manage | VM Storage Policies.