Serviceguard NFS Toolkit A.11.11.04 and A.11.23.03 Administrator's Guide

Overview of Serviceguard NFS
Supported Configurations
Chapter 116
Cascading Failover with Three Adoptive Nodes
A package may be configured with up to three adoptive nodes. Figure 1-4
shows this configuration. If Node_A fails, Pkg_1 is adopted by Node_B.
However, if Node_B is down, Pkg_1 is adopted by Node_C, and if Node_C is
down, Pkg_1 is adopted by Node_D. The adoptive nodes are listed in the
package configuration file, /etc/cmcluster/nfs/nfs.conf, in the order
in which they will be tried. Note that all four nodes must have access to
the disks for the Pkg_1 file systems.
Figure 1-4 Cascading Failover with Three Adoptive Nodes
Node_A Node_B Node_DNode_C
Pkg_1 disks
Pkg_1 disks
Before Failover:
After Failover of Node_A:
Pkg_1 disks
After Failover of Node_B:
Node_A Node_B Node_DNode_C
Node_A Node_B Node_DNode_C
B5140-90021.book Page 16 Wednesday, November 17, 2004 10:52 AM