HP StorageWorks XP10000 - Disk Array User Manual - Page 17

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HP StorageWorks XP10000 - Disk Array User Manual
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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:
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No cache
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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.
The LDEV tree does not show Auto LUN-reserved volumes because they cannot be used in Cache LUN XP
operations.

LDEV table

Information about the LDEV selected in the tree appears on a single line in the upper-right portion of the
pane. It includes LDEV number, emulation type, capacity, RAID level, and VMA information.
The LDEV's capacity is shown in MB for open systems, or cylinders and tracks for mainframe systems. The
table shows the cache settings for the LDEV selected in the tree and contains the following columns:
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LBA (open systems only): Displays the logical block starting and ending addresses.
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CC HH (mainframe systems only): Displays the cylinder and head starting and ending addresses.
•
Capacity: Displays the capacity of the cache extent in megabytes for open systems. Displays the
capacity of the cache extent in cylinders and tracks for mainframe systems.
•
Mode: Displays the mode of the cache extent. PRIO indicates priority mode, BIND indicates bind mode,
and - indicates that the LDEV is not assigned to the cache.
•
Prestage: If this is blank, then pre-staging is not set. ON indicates that pre-staging is set.

Cache LUN XP pie chart

The text above the pie chart lists the used cache and the amount of free space left in cache. For the
XP10000/XP12000, it also lists the total Cache LUN XP area and size that can be created in the SLPR
(storage logical partition).
In the pie chart, pink indicates the amount of cache available, blue shows cache used, and yellow shows
the size of the specified cache extent.

Cache settings section

Sets the mode and area for data that will reside in the Cache LUN XP cache. Also displays the settings for
an existing cache extent. This area contains the following:
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Cache LUN Mode): Select the Cache LUN XP mode by clicking either Bind or Prio.
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Prestaging Mode: Select the Prestaging check box (located above the LDEV tree) to perform the
pre-staging operation, and then click Apply. Click Yes if pre-staging is enabled. Click No if pre-staging
is disabled.
Cache LUN XP user guide for the XP10000/XP12000
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