Designing Disaster Recovery Clusters using Metroclusters and Continentalclusters, Reprinted October 2011 (5900-1881)

# pairevtwait -g dg13 -t 300 -s pair
3. Create the Delta Resync pair dg23 between DC2 and DC3 from any node in DC2:
# paircreate –g dg23 –f async –nocsus –vl –c 15 –jp <Journal_id>
-js <Journal_id>
For configuring Delta Resync pair between DC1 and DC3, the steps differ based on 3DC
Sync/CAJ or 3DC CAJ/CAJ replication. For 3DC CAJ/CAJ replication, first create Continuous
Access Journal pair between DC1 and DC2 and then between DC2 and DC3. Create a
Delta Resync pair between DC1 and DC3 after creating the Continuous Access Journal
pairs.
To create pairs with Delta Resync pair between DC1 and DC3, and when using 3DC CAJ/CAJ
replication:
1. Create the Continuous Access Journal device group between DC1 and DC2.
a. Create the Continuous Access Journal pair dg12 from any node in DC1:
# paircreate –g dg12 –f async –vl –c 15 –jp <Journal_id> -js
<Journal_id>
b. Wait for the PAIR state to come up for the dg12 Journal device group:
# pairevtwait -g dg12 -t 300 -s pair
2. Create the Continuous Access Journal device group between DC2 and DC3.
a. Create the Continuous Access Journal pair dg23 from any node in DC2.
# paircreate –g dg23 –f async –vl –c 15 –jp <Journal_id> -js
<Journal_id>
b. Wait for the PAIR state to come up for the dg13 Journal device group.
# pairevtwait -g dg23 -t 300 -s pair
3. Create the Delta Resync pair dg13 between DC2 and DC3 from any node in DC1:
# paircreate –g dg13 –f async –nocsus –vl –c 15 –jp <Journal_id>
-js <Journal_id>
NOTE: HP StorageWorks XP 3DC Sync/CAJ with Delta Resync replication does not allow the
creation of Delta Resync pair when data is being replicated in Multi-Hop topology.
To create pairs with Delta Resync pair between DC1 and DC3, and when using 3DC Sync/CAJ
replication:
1. Create the Continuous Access Synchronous device group between DC1 and DC2.
a. Create the Continuous Access Synchronous pair dg12 from any node in DC1:
# paircreate –g dg12 –f <data or never> –vl –c 15
b. Wait for the PAIR state to come up for the dg12 device group:
# pairevtwait -g dg12 -t 300 -s pair
2. Create the Continuous Access Journal device group between DC2 and DC3.
a. Create the Continuous Access Journal pair dg23 from any node in DC2:
# paircreate –g dg23 –f async –vl –c 15 –jp <Journal_id> -js
<Journal_id>
b. d. Wait for the PAIR state to come up for the dg23 Journal device group:
# pairevtwait -g dg23 -t 300 -s pair
3. Before creating a Delta Resync pair between DC1 and DC3, issue horctakeover on
DG12 pair at DC2 so that the data starts replicating in Multi-Target topology from DC2:
# horctakeover –g dg12
4. Create a Delta Resync pair between DC1 and DC3 from any node in DC1:
438 Designing a Three Data Center Disaster Recovery Solution