HP StorageWorks External Storage XP user guide (December 2005)

18 External Storage XP for the XP10000/XP12000
Figure 8 Alternate path mode is Single mode with only alternate paths in Standby
NOTE: External disk arrays with Active/Standby (A/S) controllers, such as the MSA, are an example of
Figure 8. A notable characteristic of using A/S controller disk arrays as external storage is that there is
typically only a single port to the owning controller. Paths to the non-owning external controller’s ports are
shown as Standby status. I/O load balancing does not occur across external controllers.
External Storage XP uses
Use External Storage XP to perform the following tasks for managing external disk arrays:
• ”Writing new data to mapped external LUs” on page 19
• ”Using existing data in mapped external LUs” on page 20
• ”Using external LUs for Volume Migration under Auto LUN XP” on page 21
• ”Using external LUs for Business Copy operations” on page 22