Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Understanding Serviceguard Software Components
How the Package Manager Works
Chapter 3 53
started. (In a cross-subnet configuration, all the monitored subnets that
are specified for this package, and configured on the target node, must be
up.)
If the package has a dependency on a resource or another package, the
dependency must be met on the target node before the package can start.
The switching of relocatable IP addresses is shown in Figure 3-6 and
Figure 3-7. Figure 3-6 shows a two node cluster in its original state with
Package 1 running on Node 1 and Package 2 running on Node 2. Users
connect to node with the IP address of the package they wish to use.
Each node has a stationary IP address associated with it, and each
package has an IP address associated with it.
Figure 3-6 Before Package Switching
In Figure 3-7, Node 1 has failed and Package 1 has been transferred to
Node 2. Package 1's IP address was transferred to Node 2 along with the
package. Package 1 continues to be available and is now running on Node
2. Also note that Node 2 can now access both Package1’s disk and
Package2’s disk.