Hp XP Continuous Access Software Instrukcja Użytkownika Pobierz pdf (Strona 50)

Table 12 Journal volume speciﬁcations

Item

Support speciﬁcations

Emulation type

Same

NOTE:

Only OPEN-V can

be used for journal volumes.

Volume capacity

Same or different amount of capacity is available

Table 13 list the RAID-level combination of data and journal volumes in the journal group that can be

used for Continuous Access XP Journal.

Table 13 RAID-l

evel conﬁguration of Continuous Access XP Journal

Item

Support speciﬁcations

RAID conﬁgurat

ion of data and journal volumes

RAID–1, RAID-5 and RAID-6 can coexist

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:

•ForOPEN-V

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

The ↑…↑ symbolsaroundavalueindicatethevalueshouldberoundeduptothenearestinteger.

• 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:

Ifthecalculatednumberofbitmapareasexceedsthetotalnumberofbitmapareasinthearray,

the number of pairs you can create is limited.

Use the fo

llowing 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.

Continuous Access XP Journal operations requirements and restrictions

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