HP XP External Storage Software - Manual (Page 109)

The alternate path defined in the Path Setting window is applied to the local array, and the
specified contents appear in the Device list.
If errors occur during alternate path operations, failed settings and error codes appear in the
Preset list. To check error messages, right-click the failed setting, and select Detail.
Changing a defined alternate path priority
To change the alternate path's priority, use the Priority Up and Priority Down commands displayed
in the Path Setting window (
Figure 52 ).
• Priority Up: Raises the priority of the path selected in the Alternate Path list.
• Priority Down: Lowers the priority of the path selected in the Alternate Path list.
As long as the external array uses Symmetrical Active/Active controllers (for example, XP), change
an alternate path to the currently used path by simply raising the priority of the alternate path or
lowering the priority of the currently used path.
NOTE:
If the two paths connect to different controllers on the external array (for example, MSA), do not use a
path priority change to attempt to force a controller failover. Instead, use either a manual cable disconnect
or a
Disconnect Paths GUI operation on the active controller WWN in the device list. In other words, while
the XP firmware may respond to a cable disconnect leading to the primary path and active controller as
a reason to activate the passive controller and path and continue I/Os, a simple change in path priorities
may not have the same effect, and I/Os may become blocked.
1. Select the LU Operation tab. The LU Operation pane appears.
2. In the Device tree, select the external LU group number. Information about the external LU mapped
as an internal LDEV appears in the Device list.
3. In the Device list, right-click the external LU, and select Path Setting. The Path Setting window
(
Figure 51 ) appears.
4. Detailed information about the currently used path and alternate path appears in the Configured
Paths table, and paths that can be defined as alternate paths appear in the Available Paths table.
5. In the Configured Paths table, right-click the row of the path defined as the alternate path, and
select Priority Up (
Figure 52 ). The row for the selected path switches with the row above it. The
alternate path's priority is raised, and the path is set as the currently used path.
External Storage XP user guide for the XP12000, XP10000, SVS200 109