HP XP Cache LUN Software - Manual (Page 12)

12 Cache LUN XP for the XP1024/XP128
You cannot change a Cache LUN XP extent after it is configured. To change the specification, you must
reset (“release”) the Cache LUN XP extent, and then re-allocate (“set”) the Cache LUN XP extent.
Starting Cache LUN XP
1. Click Cache LUN in the left pane. The Cache LUN pane appears.
Figure 2 Cache LUN pane
Cache LUN pane
This pane lists the following items:
Prestaging check box
Select or clear this check box to enable or disable the pre-staging function:
• If you select this check box, set the Prestaging Mode to Yes and click Apply. A non-pre-staging
operation will be performed and then a pre-staging operation will be performed.
• If you clear this check box and then click Apply, a non-pre-staging operation will be performed, but a
pre-staging operation will not be performed. If you select this check box later and then click Apply, only
a pre-staging operation will be performed.
When a pre-staging operation is in progress, the text Prestaging operation in progress is shown at the
bottom of the Cache LUN pane. The progress is displayed in percentage.
The Prestaging check box is enabled in Modify mode and is selected by default. However, the Prestaging
check box is disabled in either of the following conditions:
• No cache
• Prestaging mode is set to No for each cache
LDEV tree
The LDEV tree displays the CU number (for example, CU 00) and LDEV number (for example, LDEV 00)
available for Cache LUN XP operations in a tree. The tree uses the following icons to show the settings:
Table 4 Cache LUN XP icons
Icon Description
Indicates an LDEV for which Cache LUN XP is not set.
Indicates an LDEV for which Cache LUN XP is set.
Indicates a LUSE volume (two or more LDEVs) for which Cache LUN XP is not set.