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Journal obtain i

n Continuous Access XP Synchronous secondary sites

To perform the DC2-to-DC3 delta resync operation when a DC1 failure occurs, you must ﬁrst obtain

journal data in

DC2 the Continuous Access XP Synchronous secondary site with a 3DC multi-target

conﬁguration.

To create a Continuous Access XP Journal pair for an eventual delta resync operation,

specify the DC

2 Continuous Access XP Synchronous S-VOL in the Continuous Access XP Synchronous

secondary site as the primary data volume, and specify the DC3 data volume in the Continuous Access

XP Journal secondary site as the secondary data volume.

When creating

the contingency Continuous Access XP Journal pair for use with a DC2-to-DC3 delta

resync opera

tion, differential data for data volumes in the Continuous Access XP Synchronous primary

andsecondarysitesisstoredasMCUjournaldatainjournalvolumesintheDC2ContinuousAccessXP

Synchronous secondary site. Figure 7 shows an example.

Figur

e 7 Delta resync contingency conﬁguration in a 3DC multi-target topology (before

afai

lure occurs)

As shown in Figure 7, a Continuous Access XP Journal contingency pair created with the delta resync

option is deﬁned as a pair, but no copy operation is performed (HOLD status). No copy operations are

performed until a failure occurs and a delta resync operation is needed. There are several requirements

to create a Continuous Access XP Journal pair for delta resync operations, such as specifying an unused

mirror unit ID. For information about requirements for creating Continuous Access XP Journal pairs for

delta resync operations, see Requirements for creating Continuous Access XP Journal pairs for delta

resync operations.

Continuous Access XP Journal user guide

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Hp XP Continuous Access Software Manual do Utilizador Página 35