HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Parameters for Configuring EMS Resources..........................................................................136
About Package Dependencies...........................................................................................137
Simple Dependencies..................................................................................................137
Rules for Simple Dependencies.................................................................................137
Guidelines for Simple Dependencies.........................................................................141
Extended Dependencies...............................................................................................141
Rules for Exclusionary Dependencies.........................................................................142
Rules for different_node and any_node Dependencies.................................................143
What Happens when a Package Fails............................................................................143
For More Information...................................................................................................144
About Package Weights....................................................................................................144
Package Weights and Node Capacities.........................................................................144
Configuring Weights and Capacities.............................................................................144
Simple Method...........................................................................................................145
Example 1.............................................................................................................145
Points to Keep in Mind............................................................................................146
Comprehensive Method...............................................................................................146
Defining Capacities................................................................................................146
Defining Weights...................................................................................................148
Rules and Guidelines...................................................................................................150
For More Information...................................................................................................150
How Package Weights Interact with Package Priorities and Dependencies...........................150
Example 1.............................................................................................................151
Example 2.............................................................................................................151
About External Scripts......................................................................................................151
Using Serviceguard Commands in an External Script.......................................................153
Determining Why a Package Has Shut Down..................................................................154
last_halt_failed.......................................................................................................154
About Cross-Subnet Failover..............................................................................................154
Implications for Application Deployment.........................................................................155
Configuring a Package to Fail Over across Subnets: Example............................................155
Configuring node_name..........................................................................................156
Configuring monitored_subnet_access.......................................................................156
Configuring ip_subnet_node....................................................................................156
Configuring a Package: Next Steps....................................................................................156
Planning for Changes in Cluster Size.......................................................................................157
5 Building an HA Cluster Configuration........................................................158
Preparing Your Systems ........................................................................................................158
Installing and Updating Serviceguard ................................................................................158
Where Serviceguard Files Are Kept....................................................................................158
Creating Cluster-wide Device Special Files (cDSFs)................................................................159
Before You Start..........................................................................................................159
Creating cDSFs for a Group of Nodes...........................................................................159
Adding a Node to a cDSF Group.................................................................................161
Removing a Node from a cDSF Group...........................................................................161
Displaying the cDSF Configuration................................................................................161
Migrating Existing LVM Cluster Storage to cDSFs.............................................................161
Using Easy Deployment....................................................................................................161
Before You Start..........................................................................................................161
Using Easy Deployment Commands to Configure the Cluster.............................................162
Configuring Root-Level Access............................................................................................166
Allowing Root Access to an Unconfigured Node.............................................................166
Ensuring that the Root User on Another Node Is Recognized.............................................167
About identd..........................................................................................................167
Contents 7