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# Clusters: Configuration: Migration

Configuration Options Related Tasks Related Topics

If a clustered server fails, Node Manager can automatically restart the server and its services on another machine. This page allows you to specify the machines where Node Manager can restart migratable servers and to specify the data source used during server migration.

#### Configuration Options

Name | Description
--- | ---
Candidate Machines For Migratable Servers | The set of machines (and order of preference) on which Node Manager will restart failed servers. (Requires you to enable each server for automatic migration.) Each server can specify a subset of these cluster-wide candidates, which limits the machines on which the server can be restarted. Servers can also specify their own order of preference. MBean Attribute: `ClusterMBean.CandidateMachinesForMigratableServers` Changes take effect after you redeploy the module or restart the server.
Data Source For Automatic Migration | The data source used by servers in the cluster during migration. (You must configure each Migratable Server within the cluster to use this data source.) MBean Attribute: `ClusterMBean.DataSourceForAutomaticMigration` Changes take effect after you redeploy the module or restart the server.
Auto Migration Table Name | Return the name of the table to be used for server migration. MBean Attribute: `ClusterMBean.AutoMigrationTableName` Changes take effect after you redeploy the module or restart the server.

Related Tasks

- Configure clusters
- Configure server migration in a cluster
- Create JDBC data sources
- Configure cross-cluster replication

Related Topics

- Overview of Node Manager Configuration
- Starting and Running Node Manager
- Server Migration