About Universal Volume Manager Operations 2-13
Hitachi Universal Storage Platform V/VM Universal Volume Manager User’s Guide

External
Volume
Local Storage System
Path 2
External Storage System
A
B
External
CL2-A
Port
WWN B
LUN
5
Legend
Internal volume where external volume is mapped
Internal
Volum e
Path 1
External
CL1-A
Port
WWN A
LUN
5

Figure 2-3 Example of Alternate Path Setting

Figure 2-4 illustrates an example of setting an alternate path when a switch is

used. Two ports are specified in the local storage system, and connected to

the ports in the external storage system through the switch. In this case, two

ports of different clusters are specified in the local storage system. Therefore,

the setting of the alternate path is enabled.

External Storage System
A
B
External
CL2-A
Legend
Internal volume where the external volume is mapped
Path 2 Port
LUN
5
Internal
Volum e
External
Volum e
Local Storage System
External
CL1-A
Path 1 Port
WWN A
LUN
5
Switch

Figure 2-4 Example of Available Alternate Path Setting