# PrimaryEngines

The child servers that you want to set as the primary servers for your server groups. Use this option to set the primary servers in non-mirror mode, when you have child server groups set up and , and when DistributionMethod is set to `0` (failover).

Specify each primary servers in the following format:

    LogicalServerNumber:ServerID

where:

- `LogicalServerNumber` is the ID of the server group. This value is the number of the configuration section that contains the details for this server group.

- `ServerID` is the engine ID of the child server that you want to make the primary server of this group.

  You can find the current primary server, and the IDs of the servers that belong to each server group by sending an EngineManagement action with the EngineAction parameter set to `ShowStatus`.

To set the primary server for multiple server groups, separate each `LogicalServerNumber:ServerID` pair with a comma.

Actions: | EngineManagement
Type: | String
Default: |
Example: | `PrimaryEngines=0:1,2:5`
See Also: | EngineAction

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