A customer is designing a SAN in a clustered environment. Each server in a cluster must be able to connect to different storage systems in the SAN simultaneously. The customer plans to add a tape back

Zoning by application groups devices based on the application they serve, which does not inherently support each cluster node connecting to multiple storage systems or limit the impact of incorrect zone changes.

Port-based zoning ties zone membership to a specific physical switch port, so any port reconfiguration or addition of a future tape system risks disrupting existing zones more severely than WWN-based zoning.

Zoning by HBA uses the World Wide Name (WWN) of each host bus adapter to define zone membership, so servers can maintain connections to multiple storage systems simultaneously as required by the clustered environment. Because membership follows the HBA identifier rather than a physical switch port, an incorrect zone change on a switch port does not automatically disrupt established paths, minimizing impact. This approach also makes adding a future tape backup system straightforward without redesigning the zone layout.

Zoning by operating system groups hosts sharing the same OS, which does not address the requirement for multi-storage connectivity per cluster node or reduce the impact of accidental zone modifications.