HP StorageWorks External Storage XP user guide (T1706-96006, June 2006)

90 Configuring external LUs
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.
Figure 52 Path Setting window, shortcut menu
6. Repeat the Priority Up command until the row of the selected path is displayed on the first line of the
Configured Path list and that row’s Priority column changes to 1.
When the Priority column changes to 1, the path is set as the typically used one (primary path).
7. Click OK. The Path Setting window closes, and the LU Operation pane appears.
Selected rows appear in blue italics in the Device list. Specified contents appear in the Preset list. To
check details on intended operations, right-click the setting in the Preset list, and select Detail. To cancel
settings, right-click the setting in the Preset list, and select Delete.
8. Click Apply. A confirmation message appears.