HP Serviceguard Toolkit for NFS manual Cascading Failover with Three Adoptive Nodes

Overview of MC/ServiceGuard NFS

Supported Configurations

	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

Before Failover:

Node_A

Pkg_1 disks

After Failover of Node_A:

Node_B

Node_C

Node_D

Node_A Node_B

Pkg_1 disks

After Failover of Node_B:

Node_C

Node_D

Node_A

Node_B

Node_C

Node_D

Pkg_1 disks

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