HP StorageWorks External Storage XP user guide (December 2005)

16 External Storage XP for the XP10000/XP12000
NOTE: As you restore the path with a priority higher than the current path, the I/O execution path
automatically switches to the restored path with the highest priority.
Figure 6 Alternate path mode is Single mode
Alternate path mode is Single mode and at least one alternate path is in Standby status
Figure 7 shows an example of when the alternate path mode is Single mode and there are alternate paths
in Normal and Standby status. Figure 8 shows another example of when the alternate path mode is Single
mode. In Figure 8, there are only alternate paths in Standby status.
When an error occurs in the path used for I/Os, the I/O execution path switches to the path with the
second highest priority in Normal status (see Figure 7). If there is no path in Normal status other than the
path used for I/Os, the status of the path in Standby status automatically changes to Normal and the I/O
execution path switches to that path (see Figure 8).