Managing Serviceguard Eighteenth Edition, September 2010

Rules for different_node and any_node Dependencies...................................186
What Happens when a Package Fails....................................................................186
For More Information.............................................................................................187
About Package Weights...............................................................................................187
Package Weights and Node Capacities..................................................................188
Configuring Weights and Capacities.....................................................................188
Simple Method.......................................................................................................188
Example 1..........................................................................................................188
Points to Keep in Mind.....................................................................................190
Comprehensive Method.........................................................................................190
Defining Capacities...........................................................................................190
Defining Weights..............................................................................................192
Rules and Guidelines.............................................................................................195
For More Information.............................................................................................195
How Package Weights Interact with Package Priorities and Dependencies.........196
Example 1..........................................................................................................196
Example 2..........................................................................................................196
About External Scripts.................................................................................................197
Using Serviceguard Commands in an External Script..........................................199
Determining Why a Package Has Shut Down.......................................................200
last_halt_failed..................................................................................................200
About Cross-Subnet Failover......................................................................................201
Implications for Application Deployment.............................................................202
Configuring a Package to Fail Over across Subnets: Example..............................202
Configuring node_name...................................................................................203
Configuring monitored_subnet_access............................................................203
Configuring ip_subnet_node............................................................................203
Configuring a Package: Next Steps.............................................................................204
Planning for Changes in Cluster Size...............................................................................204
5 Building an HA Cluster Configuration.......................................................................................205
Preparing Your Systems ...................................................................................................205
Installing and Updating Serviceguard .......................................................................205
Where Serviceguard Files Are Kept............................................................................206
Creating Cluster-wide Device Special Files (cDSFs)...................................................206
Before You Start......................................................................................................207
Creating cDSFs for a Group of Nodes...................................................................207
Adding a Node to a cDSF Group...........................................................................209
Removing a Node from a cDSF Group..................................................................209
Displaying the cDSF Configuration.......................................................................210
Migrating Existing LVM Cluster Storage to cDSFs................................................210
Using Easy Deployment..............................................................................................210
Before You Start......................................................................................................210
8 Table of Contents