HP StorageWorks XP Remote Web Console Software - Manual (Page 60)

60 External Storage XP for the XP10000/XP12000
Changing the priority of alternate paths
To change the priority of alternate paths, use the Priority Up and Priority Down commands displayed in the
Path Setting window ( Figure 36 ). Priority Up raises the priority of the path selected in the Alternate Path
list. Priority Down lowers its priority.
As long as both paths go to the same external controller, or 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. In the External Storage XP operations window, click LU Operation. The LU Operation pane appears.
2. Select the external LU group number in the Device Tree (left pane).
Information about the external LU mapped as an internal XP LDEV appears in the Device List (right
pane).
3. In the Device List, select the desired external LU, right-click, and select Path Setting.
4. Select the row of the path defined as the alternate path in the Configured Paths table, right-click, and
select Priority Up.
Figure 36 Using Priority Up to raise defined alternate paths in the LU Operation pane
The selected row appears at the top of the Alternate Path list, and text in the Priority column changes
from 2 to 1. The priority of the alternate path is raised, and the path is set as the currently used path.
5. Click OK in the Path Setting window.
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, select the setting in the Preset list, right-click, and select Detail. To
cancel settings, select the setting in the Preset list, right-click, and select Delete.