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Cache LUN XP for the XP10000/XP12000

Use HP StorageWorks Cache LUN XP to reserve areas of cache memory on the disk array for storing

high-use data from the LDEVs. Data access speed is improved because the cache-resident data is available

to the hosts at much faster transfer speeds. This can be applied to both read and write I/O operations.

Cache LUN XP works with normal volumes, LUSE volumes, and custom volumes (configured through VSC).

Use custom volumes and Cache LUN XP together to achieve higher data access performance (than when

these features are used separately).

Use Cache LUN XP to perform the following tasks:

• "Setting (creating) a cache

• "Releasing (removing) a cache

• "Changing an extent's mode and

Figure 1

Cache LUN XP requires a portion of cache memory, called the Cache LUN XP cache area. You can

change the capacity of the Cache LUN XP cache area when installing or removing cache memory.

Typically, data assigned to Cache LUN XP becomes resident (staged) in cache after it is first accessed by a

host. Then, the host finds the data in cache for the second and subsequent accesses.

Another function, called pre-staging, puts data in the Cache LUN XP cache area when the data is first set

up for caching. Pre-staging allows the host to find data in the cache at the first access.

Cache areas (also called cache extents) can be added or removed at any time. Each cache extent is

defined as a range of logical blocks within an LDEV or as an entire LDEV. Logical blocks are defined by

starting and ending Logical Block Addresses (LBAs).

Supported open system emulation types are OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-L, and OPEN-V.

Supported mainframe emulation types are 3390-3, 3390-3A, 3390-3B, 3390-3C, 3390-3R, 3390-9,

3390-9A, 3390-9B, 3390-9C, 3390-L, 3390-LA, 3390-LB, 3390-LC, 3390-M, 3390-MA, 3390-MB, and

3390-MC.

LUSE (LU Size Expansion) and VSC (Volume Size Configuration) volumes can be placed in the Cache LUN

XP cache area.

If you want to apply Cache LUN XP to a LUSE volume, you must apply Cache LUN XP to all the LDEVs that

form the LUSE volume.

extent" on page 18

extent" on page 20

pre-staging" on page 21

Cache LUN XP user guide for the XP10000/XP12000