HP XP External Storage Software - Manual (Page 30)

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 alternate paths in Standby status only.
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 (
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 (
Figure 8 ).
NOTE:
When the external array is an EVA array, as you restore the path with the highest priority, the
I/O execution path switches back to the restored highest priority path. In this case, the status of
the path for which the status changed to Normal when the error occurred changes back to Standby.
Preparing for External Storage XP operations 30