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

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HP Serviceguard manual Building an HA Cluster Configuration 158