HP Serviceguard Toolkit for NFS manual Host Configured as Adoptive Node for Multiple, Packages

Overview of MC/ServiceGuard NFS

Supported Configurations

	A Host Configured as Adoptive Node for Multiple
	Packages
	Figure 1-3 shows a three-node configuration where one node is the
	adoptive node for packages on both of the other nodes. If either Node_A or
	Node_C fails, Node_B adopts the NFS server package from that node.
Figure 1-3	A Host Configured as Adoptive Node for Multiple Packages

Before Failover:

Node_A

Pkg_1

disks

Node_B

Pkg_2

disks

Node_C

After Failover:

Node_A

Pkg_1

disks

Node_B

Pkg_2

disks

Node_C

When Node_A fails, Node_B becomes the server for Pkg_1. If Node_C fails, Node_B will become the server for Pkg_2. Alternatively, you can set the package control option in the control script, nfs.cntl, to prevent Node_B from adopting more than one package at a time. With the package control option, Node_B may adopt the package of the first node that fails, but if the second node fails, Node_B will not adopt its package. The package control option prevents a node from becoming overloaded by adopting too many packages. If an adoptive node becomes overloaded, it can fail.

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