The goal for VMware is to virtualize as much of the data center as possible. The roadblock to high VM density per host is storage performance and data protection. The vStorage API set now has three basic integration points; backup integration, array integration and replication integration. The API allows a backup application to get block level access to VMDK files, meaning that incremental, image level backups of VMs can happen in minutes. The days of dealing with millions of individual files per server may be over.”]
Source: https://www.darkreading.com/database-security/vstorage-api-spreads-its-wings