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priority mode, write operations do not have to wait for available cache segments, and there will

be no backend contention caused by destaging data.

Table 2 Bind Mode Cache Residency Cache Requirements

Cache Residency Cache

Requirement

Capacity SpecificationsRAID Level or

Volume Type

System Type

3 times the space required

for user data: 1 slot = 3 x

264 KB = 792 KB = 48

cache segments

Slot capacity: 264 KB

Cache segment capacity: 16.5 KB

Cache segments needed per slot: 48 (slot

capacity / cache segment capacity)

RAID 5 (3390)

or RAID 6

OPEN Systems

2 times the space required

for user data: 1 slot = 2 x

264 KB = 528 KB = 32

cache segments

Slot capacity: 264 KB

Cache segment capacity: 16.5 KB

Cache segments needed per slot: 32 (slot

capacity / cache segment capacity)

RAID 1, or

external volumes

3 times the space required

for user data: 1 slot = 3 x

66 KB = 198 KB = 12

cache segments

Slot capacity: 66 KB

Cache segment capacity: 16.5 KB

Cache segments needed per slot: 12 (slot

capacity / cache segment capacity)

Note: Even though a track for mainframe

is 56 KB, because cache is divided into

16.5 KB segments, it requires 4 segments.

RAID 5 zSeries

and S/390 or

RAID 6

Mainframe (for

example, 3390-3,

3390-9, z/OS,

etc.)

2 times the space required

for user data: 1 slot = 2 x

66 KB = 132 KB = 8 cache

segments

Slot capacity: 66 KB

Cache segment capacity: 16.5 KB

Cache segments needed per slot: 8 (slot

capacity / cache segment capacity)

RAID 1 zSeries

and S/390, or

external volumes

Cache Residency bind data that has write attributes is normally not de-staged. However, this data

will be de-staged in the following cases:

• During cache blockage that is caused by certain maintenance operations (for example, cache

upgrades) or that is caused by cache failure.

• If the subsystem is powered off.

• If the volume is deleted from Cache Residency bind mode.

• If a fixed or customized volume that is partly or wholly assigned to Cache Residency is

converted into free space by the Virtual LVI/LUN Volume-to-Space function.

• If a VDEV containing volumes that are assigned to Cache Residency is initialized by the Virtual

LVI/LUN Volume Initialization function.

For further information on Virtual LVI/LUN, see the HP StorageWorks XP24000/XP20000

Virtual LVI/LUN (VLL) and Volume Shredder User Guide.

Changing from Priority Mode to Bind Mode

Changing the mode without cache extension requires a Cache Residency re-configuration.

Using Pre-staging for Immediate Data Access in Priority and Bind Modes

You can use the pre-staging function to make data available from the Cache Residency cache the

first time the host accesses the data. Both priority mode and bind mode permit pre-staging.

8 About Cache Residency Manager Operations

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