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• The user has the option of pre-staging the data to the resident cache area. If pre-staging is

not used, the data will be loaded into the Cache Residency extents when the first miss occurs.

If pre-staging is used, performance may be affected for a short time while the data is read

into Cache Residency cache.

Note: Pre-staging of Cache Residency data should not be performed during peak activity.

• All write I/Os to Cache Residency data are duplex writes, guaranteeing full data integrity.

The Cache Residency data remains fixed in cache until the user manually deletes it. Deletion

of Cache Residency extents will destage any write data to the affected volume(s).

• It is possible to expand the amount of Cache Residency cache without canceling the existing

Cache Residency settings. Call HP technical support for assistance.

Table 3 Cache Residency Manager Specifications

SpecificationsItem

Mainframe: (zSeries and S/390)Open System

• 3380-3, 3A, 3B, 3C, F, K, KA, KB, KC

• 3390-3, 3A, 3B, 3C, 3R, 9, 9A, 9B, 9C, L, LA,

LB, LC, M, MA, MB, MC

• NF80-F, K, KA, KB, KC

OPEN-3, 8, 9, E, L, VEmulation type

Virtual LVI (VLL) volumeHP StorageWorks XP LUN

Expansion (LUSE) volume and Virtual

LUN (VLL) volume

Supported

volumes

At least one cache slot (or track): Equivalent to 66

KB.

Up to 1 LDEV

For OPEN-V, at least 512 LBAs

(Logical Block Address): Equivalent

to 264 KB

For other than OPEN-V, at least 96

LBAs (Logical Block Address):

Equivalent to 66 KB

Unit of cache

area allocation

In Subsystem: 16,384

In LDEV: 4,096

Number of cache

areas

Cache Residency Manager Restrictions

The following are restrictions on the use of the Cache Residency function:

WARNING: Do not perform the XP Business Copy Software quick restore operation or the XP Auto

LUN Software operation on a Cache Residency volume. Also, do not specify the Cache Residency

setting on the volume where the XP Business Copy Software quick restore or the XP Auto LUN

Software operation is performed. These operations swap the internal locations of the source and

target volumes and this causes a loss of data integrity.

For additional information, see the HP StorageWorks XP24000/XP20000 Business Copy Software

User Guideand/or contact technical support.

• Do not attempt to allocate Cache Residency cache beyond the allocated capacity.

• Do not apply Cache Residency settings to volumes reserved for Auto LUN.

• Do not attempt to allocate Cache Residency cache redundantly over the cache area that is

already allocated to an LDEV.

• The Cache Residency bind mode is not available to external volumes whose Cache mode is

set to Disable (which is the mode that disables the use of the cache when there is an I/O

request from the host).

16 Preparing for Cache Residency Manager Operations

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