Rules that you include in a storage policy can be based on storage-specific data services and tags, or the rules can be common.

Common rules are based on data services that are generic for all types of storage and do not depend on a datastore. These additional services become available in the VM Storage Policies interface when you install third-party I/O filters developed through vSphere APIs for I/O Filtering. You can reference these data services in a VM storage policy.

These rules are based on data services that storage entities such as Virtual SAN and Virtual Volumes advertise.

Rules based on tags reference datastore tags that you associate with specific datastores. You can apply more than one tag to a datastore.