Hp XP Array Manager Software Instrukcja Użytkownika Pobierz pdf (Strona 14)

a. Where the bind mode is set:

For RAID-1:

• Required cache size = Number of addresses x (512 + 16) x 2 ÷ 1,024

The unit is KB.

For RAID type other than RAID-1:

• Required cache size = Number of addresses x (512 + 16) x 3 ÷ 1,024

The unit is KB.

b. Where the priority mode is set:

• Required cache size = Number of addresses x (512 + 16) ÷ 1,024

The unit is KB.

Note: If a RAID-5 or RAID-6 volume area is changed from priority mode to bind mode and no

cache is added, then only 33 percent of the user data will fit in the area previously assigned for

priority mode, and 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, then only 50 percent

of the user data will fit in the area previously assigned for priority mode, and the remaining 50

percent is used to save read/write data. Changing the mode without cache extension requires a

Cache Residency reconfiguration.

Cache Requirements for Mainframe Systems

To calculate the cache size for the mainframe systems:

1. Calculate the converted values of the starting address and the ending address.

To calculate the converted values of the starting address and the ending address for the all

specified LDEVs:

• Setting value of ending address (CC) = (↓((LDEV size x 15) - 1) ÷ 15↓)

Round down the value that is calculated from the formula between the two downward

arrows (↓) after the decimal point.

Setting value of ending address (CC) is the value which is input in the Cache Residency

window.

• Setting value of ending address (HH) = ((LDEV size x 15) - 1) Mod 15

The remainder will be the setting value of ending address (HH).

Setting value of ending address (HH) is the value which is input in the Cache Residency

window.

• Converted value of starting address = 0

• Converted value of ending address

= Setting value of ending address (CC) x 15 + Setting value of ending address (HH)

Setting value of ending address (CC) and Setting value of ending address (HH) is the

value which is input in the Cache Residency window.

To calculate the converted values of the starting address and the ending address if the volumes

are specified:

• Converted value of starting address

= Setting value of starting address (CC) x 15 + Setting value of starting address (HH)

14 Preparing for Cache Residency Manager Operations

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