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

Cascading Failover in a Continental Cluster
Overview
Chapter 8366
The Symmetrix configuration is shown in Figure 8-2.
Figure 8-2 Symmetrix Configuration for Cascading Failover
Using Template Files
Cascading failover configurations are built using the EMC SRDF control
script template, /opt/cmcluster/toolkit/SGSGRDF/srdfpkg.cntl.
This file should be used on all ContinentalClusters nodes and clusters
that:
• will run a package in the primary MC/ServiceGuard cluster and
will run a recovery package in the recovery MC/ServiceGuard cluster
and
whose data are on an EMC Symmetrix ICDA connected to the
primary cluster and replicated with SRDF to a second EMC
Symmetrix ICDA also connected to the primary cluster, and then
replicated with SRDF to a third EMC Symmetrix ICDA connected to
the recovery cluster
In addition to the basic template, there is a set of sample scripts that
illustrate how to carry out most of the procedures described in this
chapter. These scripts will be found in the
/opt/cmcluster/toolkit/SGSRDF/cascade/Samples directory.
To use these files, follow the procedures detailed in the next sections.