Hp XP Continuous Access Software Manual de usuario descargar pdf (Pagina 43)

Table 11 Journal volume specifications

Support specificationsItem

Same

NOTE: Only OPEN-V can be used

for journal volumes.

Emulation type

Same or different amount of

capacity is available

Volume capacity

Table 12 (page 43) list the RAID-level combination of data and journal volumes in the journal

group that can be used for XP Continuous Access Journal.

Table 12 RAID-level configuration of XP Continuous Access Journal

Support specificationsItem

RAID–1, RAID-5 and RAID-6 can

coexist

RAID configuration of data and

journal volumes

RAID-1, RAID-5 and RAID-6 can coexist in the same journal group.

Maximum number of pairs

NOTE: The number of pairs you can create in an array is limited.

Use the number of cylinders and bitmap areas to calculate the maximum number of pairs you can

create in an array.

• Number of cylinders:

The number of pairs of a primary and a secondary data volume is limited. The number of

pairs depends on the volume capacity (that is, the number of cylinders in the volumes forming

pairs). If you use Custom Volume Size (CVS), the number of pairs depends on the number of

cylinders that CVS specifies. A limit on the number of pairs is applied to the primary and

secondary arrays. Use the following formula to calculate the number of cylinders for different

emulation types:

◦ For OPEN-V

Number of cylinders = ( ( ( (Max. LBA/512) ) /15) ) + 1

The ... symbols around a value indicate the value should be rounded up to the nearest

integer.

• Number of bitmap areas:

Calculate the number of bitmap areas to be used by all data volumes forming pairs from the

number of cylinders. If one pair of extended shared memories is used, 11,605 bitmap areas

can be used in an array. If two pairs of extended shared memories are used, 28,671 bitmap

areas can be used in an array.

NOTE: If the calculated number of bitmap areas exceeds the total number of bitmap areas

in the array, the number of pairs you can create is limited.

Use the following formula to calculate the number of bitmap areas to be used for each volume:

Number of bitmap areas = ( ((Number of cylinders × 15) / 122,752) )

The ... symbols around a value indicate the value should be rounded up to the nearest

integer.

Requirements and restrictions for XP Continuous Access Journal 43

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