Figure 16 Host maintenance at the primary site (3DC Multi-Target configuration)
The Delta Resync configuration
The delta resync configuration creates a Continuous Access Journal copy pair (delta resync pair)
between the local site and remote site in a 3DC Multi-Target configuration. Delta resyncs can be
executed to synchronize the delta resync pair by copying to the remote site only the differential
data between the local and remote sites. This enables operations to continue temporarily in a 3DC
Multi-Target configuration with the local site as the origin with very little downtime, even when the
primary site host stops.
Figure 17 (page 48) gives an example of a delta resync configuration before a delta resync is
performed, and Figure 18 (page 48) gives an example of a delta resync configuration after a
delta resync is performed.
Replication products and data center configurations 47
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