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The [ndb_mgmd]  section is used to configure the behavior of the management server. If multiple management servers are employed, you can specify parameters common to all of them in an [ndb_mgmd default]  section. [mgm]  and [mgm default]  are older aliases for these, supported for backward compatibility. 

All parameters in the following list are optional and assume their default values if omitted. 

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• Id 

## Note 

If neither the ExecuteOnComputer  nor the HostName  parameter is present, the default value localhost  is assumed for both. 

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Each node in the cluster has a unique identity. For a management node, this is represented by an integer value in the range 1 to 255, inclusive. This ID is used by all internal cluster messages for addressing the node, and so must be unique for each NDB Cluster node, regardless of the type of node. 

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## Note 

Data node IDs must be less than 145. If you plan to deploy a large number of data nodes, it is a good idea to limit the node IDs for management nodes (and API nodes) to values greater than 144. (In NDB 8.0.17 and earlier, the maximum value for a data node ID was 48.) 

The use of the Id  parameter for identifying management nodes is deprecated in favor of NodeId . Although Id  continues to be supported for backward compatibility, it now generates a warning and is subject to removal in a future version of NDB Cluster. 

• NodeId 

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Each node in the cluster has a unique identity. For a management node, this is represented by an integer value in the range 1 to 255 inclusive. This ID is used by all internal cluster messages for addressing the node, and so must be unique for each NDB Cluster node, regardless of the type of node. 

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## Note 

As of NDB 8.0.18, data node IDs must be less than 145. (Previously, this was less than 49.) If you plan to deploy a large number of data nodes, it is a good idea to limit the node IDs for management nodes (and API nodes) to values greater than 144. 

