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

Cascading Failover in a Continental Cluster
Primary Cluster Package Setup
Chapter 8376
Primary Cluster Package Setup
This section only describes the required changes to the package control
script to support the cascading failover configuration. To create a
primary package on the primary cluster, the reader should follow the
procedure in “Setting up a Primary Package on the Primary Cluster” on
page 338.
Cascading failover uses a ContinentalClusters in which the primary
cluster is configured as a metropolitan cluster. Therefore, there are a
few differences from the normal ContinentalClusters configuration in
customizing the environment file <package_name>_srdf.env.
1. The CLUSTER_TYPE variable should be set to “metro”
2. The DEVICE_GROUP variable should be set to the Symmetrix device
group name defined in the primary and secondary Symmetrix
according to what Symmetrix is directly connected to the node.
Before executing the cmapplyconf on the primary cluster, make sure to
split the SRDF logical links, between the primary Symmetrix and the
secondary Symmetrix, for the disks associated with the application
package. Run the following command on a node that connects to the
primary Symmetrix:
# symrdf -g <prisymdevgrpname> split -v