Managing MC/ServiceGuard NFS A.11.11.03 and A.11.23.02 (June 2004)

Overview of MC/ServiceGuard NFS
Supported Configurations
Chapter 1 15
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
When Node_A fails, Node_B becomes the server for Pkg_1.IfNode_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.
Node_A Node_B
Node_C
Pkg_2
disks
Pkg_1
disks
Before Failover:
After Failover:
Node_A Node_B
Node_C
Pkg_2
disks
Pkg_1
disks
B5140-90020.book Page 15 Thursday, June 3, 2004 5:04 PM