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

Figure 38 Applications Deployed in a 3DC DR Solution using Tri-Link Configuration
Node A
FC Switch
Sync
Replication
for A
Journal
Replication
for B
Journal Replication for A
Array
Node B
FC Switch
Array
Node A Node B
FC Switch
Array
Journal
Replication
for B
Continental Cluster
Metrocluster
Serviceguard
Cluster
A Continuous Access Synchronous device group pair must be established when using 3DC Sync/CAJ
replication to replicate data between the arrays at the application’s DC1 and DC2 sites. A
Continuous Access Journal device group pair must be established when using 3DC CAJ/CAJ
replication to replicate data between the arrays at the application’s DC1 and DC2 sites. Figure 38
(page 103) depicts both the applications configured using 3DC Sync/CAJ replication and 3DC
CAJ/CAJ replication. You can also have all the applications using only 3DC Sync/CAJ replication
or all the applications using only 3DC CAJ/CAJ replication in a 3DC environment based on your
requirements. Two other Continuous Access Journal pairs, one from the DC1 to DC3 site and
another from DC2 to DC3 site must be created. At any given time, only one of the latter Continuous
Access Journal pairs (DC1-DC3 or DC2-DC3) can be active. So, either the DC1 to DC3 or the
DC2 to DC3 Continuous Access Journal pair must be configured as a Delta Resync pair.
The following terms are used throughout this document to denote these three device groups:
DC1-DC2 pair: The device group pair between DC1 and DC2.
3DC DR Solution Configuration 103