To configure host group security on a new HCP G10 with attached storage, the World Wide Port Name (WWPN) is required. The WWPN is a unique identifier for each Fibre Channel port in a storage area network (SAN) environment. It is used to configure access control and define which hosts can communicate with specific storage resources. This setting ensures that only authorized hosts can access the storage, enhancing the overall security of the HCP system. This requirement is documented in the "Hitachi Vantara HCP G10 Storage Configuration Guide."