HP StorageWorks XP Remote Web Console Software - Manual (Page 16)

16 Cache LUN XP for the XP10000/XP12000
b. Priority mode
Required cache size = (Number of addresses Ч (128 Ч (512 + 16) ) ) ч 1,024
Units are KB
NOTE: If a RAID-5 or RAID-6 volume area is changed from priority mode to bind mode and no cache is
added, only 33 percent of the user data fits into the area previously assigned for priority mode. The
remaining 67 percent is used to save read/write data. If a RAID-1 volume area is changed from priority
mode to bind mode and no cache is added, only 50 percent of the user data fits in the area previously
assigned for priority mode. The remaining 50 percent is used to save read/write data. Changing the
mode without cache extension requires Cache LUN XP reconfiguration.
Starting Cache LUN XP
1. Click Cache LUN in the left pane. The Cache LUN pane appears.
Figure 3 Cache LUN pane
Cache LUN pane
This pane lists the following items.
CLPR drop-down list
Use this drop-down list to select a cache logical partition (CLPR). The CLPR drop-down list displays the CLPR
number and CLPR name.
When you select a CLPR, volumes belonging to the selected CLPR and cache information appear in the
LDEV tree.
NOTE: If you administer only one CLPR, the CLPR drop-down list is not available.
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.