HP XP External Storage Software User Guide (T1706-96018, November 2011)

Example of an alternate path configuration
Figure 2 (page 20) shows an example of an alternate path configuration. In Figure 2 (page 20),
external array ports WWN A and WWN B are connected to CL1-A and CL2-A, respectively,
which are designated as external ports in the local array. You must specify the port of a different
cluster in the local array for the alternate path, as ports CL1 and CL2 are specified in the figure.
Figure 2 Example of alternate path configuration
Figure 3 (page 20) shows another example of an alternate path configuration. In Figure 3 (page
20), two ports are specified in the local array and connected to ports in the external array via
switches. In this example, two ports from different XP12000/XP10000/SVS200 clusters are
specified in the local array, thereby making it possible to configure an alternate path for high
availability.
Figure 3 Example of alternate path configuration using two switches
In Figure 4 (page 21), two paths are configured between the internal LDEV and external LU.
However, only one port is specified in the local array and two ports are specified in the external
arrays via the switch. Since two ports of different clusters must be set in the local array for XP
External Storage to use alternate path settings, HP does not recommend the configuration shown
in Figure 4 (page 21).
20 Preparing for XP External Storage operations