Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access for P9000 and XP A.11.00

data replication is established to replicate data between the arrays at Site1 and Site2 when
using 3DC CAJ/CAJ replication.
• Continuous Access Journal data replication must be established between one of the arrays
located in the Metrocluster - Site1 or Site2 - and the array located at Site3. This replication
pair is used to replicate data to Site3 actively and will be referred as Active-CAJ pair.
• A Delta Resync pair is configured over the remaining data replication link between Site1 or
Site2 and the array located at Site3. The Delta Resync pair is a suspended journal volume,
which can be resynchronized to replicate data to Site3 in case of data not being replicated
to Site3 using the Active-CAJ pair. If the Active-CAJ pair is configured between Site1 and
Site3 then the Delta Resync pair must be configured between Site2 and Site3. Similarly, if the
Active-CAJ pair is configured between Site2 and Site3 then the Delta Resync pair must be
configured between Site1 and Site3.
In a Bi-Link configuration, there are two Continuous Access replication links configured. A replication
link is configured between Site1 and Site2 of Metrocluster and another replication link is configured
either between Site1 and Site3 or between Site2 and Site3.
Figure 26 (page 92) shows the Bi-Link configuration with the replication link configured between
Site1 and Site3.
Figure 26 Bi-Link Configuration with the replication link between Site1 and Site3
Continentalclusters
Primary Cluster
(Metrocluster)
Recovery Cluster
(Serviceguard cluster)
Site 1
Node Node Node Node Node Node
Site 2 Site 3
Quorum server
for recovery cluster
Figure 27 (page 93) shows the Bi-Link configuration with the replication link configured between
Site2 and Site3.
92 Designing a Three Data Center Disaster Recovery Solution