Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Cascading Failover in a Continental Cluster
Data Replication Procedures
Chapter 8 387
the package device group. The failback will synchronize the R1
devices from the R2 devices. Until the synchronization is complete,
the package application may run at a lower performance level.
5. Use the following command to check the RDF pair state between the
R1 devices in the primary Symmetrix to the R2 devices in the
secondary Symmetrix. From a host that connects to the secondary
Symmetrix:
# symrdf -g <secsymdevgrpname> query
From a host that connects to the primary Symmetrix:
# symrdf -g <prisymdevgrpname> query
If the “RDF Pair STATE” column shows the state “Synchronized” for
all the devices, then proceed to the next step
6. Re-establish the BCV/R1 devices in the secondary Symmetrix as a
mirror of the standard device. From a host that connects to the
secondary Symmetrix:
# symmir -g <secsymdevgrpname> est
From a host that connects to the primary Symmetrix:
# symmir -g <prisymdevgrpname> est -rdf