HP XP External Storage Software - Manual (Page 27)

Figure 9 When the Path Mode is Single Mode
• When the path mode is Single mode and there is at least one alternate path in the Standby status
Figure 10 on page 28 shows an example of the case when the path mode is Single mode, and
there are the alternate paths in the Normal status and the Standby status. Figure 11 on page 29
shows another example of the case when the path mode is Single mode. In the case of
Figure 11 on page 29, there are alternate paths in the Standby status only.
When an error occurs in the path that is being used for I/Os, the I/O execution path is switched
to the path with the second highest priority in the Normal status (see Figure 10 on page 28). If
there is no path in the Normal status other than the path that is being used for I/Os, the status of
the path in the Standby status is automatically changed to Normal, and the I/O execution path is
switched to that path (see Figure 11 on page 29).
Note: Only when the external storage system is EVA storage system, as you restore the path with
the highest priority, the I/O execution path is switched back to the restored highest priority path.
In this case, the status of the path for which the status has been changed to Normal when the
error has occurred is changed back to Standby.
XP24000 External Storage Software User’s Guide 27