Determining If The Cache Mode Is Disabled; Changing The Cache Mode; Collecting Device Information; Lu Operation Pane, Cache Mode Setting - HP StorageWorks XP12000 User Manual

Determining if the cache mode is disabled

If you have an existing configuration and need to determine if your external LUs are configured with cache
mode disabled, follow this procedure:
1. In the XP Remote Web Console main pane, click the External Storage button in the left pane. The LU
Operation pane appears.
2. In the Device tree, select an external device group.
3. In the Device list, check the Cache Mode setting
change it to Disabled.
Figure 18

LU Operation pane, Cache Mode setting

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:
44 Managing cache with external storage
(Figure 18). If cache mode is enabled, you should