HP XP External Storage Software - Manual (Page 14)

Figure 1 Unifying Copy Operations between Different Storage Systems
Unifying Connections from a Host to Different Storage Systems
When a system has multiple storage systems, a host usually needs to connect all storage systems. When
a system administrator configures the connections from a host to volumes, they need to follow the different
instructions depending on the storage systems.
If you install External Storage, a system administrator only needs to configure the connection from a host
to the storage system. After the configuration is completed, a host can manipulate volumes in the external
storage system in the same way as volumes in the storage system.
14 Overview of HP StorageWorks XP External Storage Software