HP StorageWorks XP External Storage user guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1706-96017, June 2010)

Changing the cache mode
If you need to change the cache mode for existing external LUs, you must delete and remap the
external LU path and definition.
CAUTION:
Before you delete any LUs that you want to remap, carefully record necessary configuration information.
If you remap existing LUs with changed configuration settings (other than cache mode), you can lose
access to the LUs and the data they contain.
Collecting device information
Before you remap an external storage device, collect the following information for each device:
• LU number in the group
• Universal Unique ID (UUID)
• Path settings
• CVS settings
• Mapped location
• External group number
• CU:LDEV identifier
To collect each of these items:
1. In the Remote Web Console main pane, click the External Storage button in the left pane. The
LU Operation pane appears.
2. To find the LU number and UUID, select an external device group in the Device tree (Figure 20).
The LU number appears in the LUN column in the Device list.
The UUID appears in the Characteristic2 column in the Device list.
Figure 20 LU Operation pane, LU number and UUID
.
XP External Storage Software User Guide 57