#### 23.4.2.2 NDB Cluster Management Node Configuration Parameters

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 The listing in this section provides information about parameters used in the `[ndb_mgmd]` or `[mgm]` section of a `config.ini` file for configuring NDB Cluster management nodes. For detailed descriptions and other additional information about each of these parameters, see [Section 23.4.3.5, “Defining an NDB Cluster Management Server”](mysql-cluster-mgm-definition.html).

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* `[ArbitrationDelay](mysql-cluster-mgm-definition.html#ndbparam-mgmd-arbitrationdelay)`: When asked to arbitrate, arbitrator waits this long before voting (milliseconds).

* `[ArbitrationRank](mysql-cluster-mgm-definition.html#ndbparam-mgmd-arbitrationrank)`: If 0, then management node is not arbitrator. Kernel selects arbitrators in order 1, 2.

* `[DataDir](mysql-cluster-mgm-definition.html#ndbparam-mgmd-datadir)`: Data directory for this node.

* `[ExecuteOnComputer](mysql-cluster-mgm-definition.html#ndbparam-mgmd-executeoncomputer)`: String referencing earlier defined COMPUTER.

* `[ExtraSendBufferMemory](mysql-cluster-mgm-definition.html#ndbparam-mgmd-extrasendbuffermemory)`: Memory to use for send buffers in addition to any allocated by TotalSendBufferMemory or SendBufferMemory. Default (0) allows up to 16MB.

* `[HeartbeatIntervalMgmdMgmd](mysql-cluster-mgm-definition.html#ndbparam-mgmd-heartbeatintervalmgmdmgmd)`: Time between management-node-to-management-node heartbeats; connection between management nodes is considered lost after 3 missed heartbeats.

* `[HeartbeatThreadPriority](mysql-cluster-mgm-definition.html#ndbparam-mgmd-heartbeatthreadpriority)`: Set heartbeat thread policy and priority for management nodes; see manual for allowed values.

* `[HostName](mysql-cluster-mgm-definition.html#ndbparam-mgmd-hostname)`: Host name or IP address for this management node.

* `[Id](mysql-cluster-mgm-definition.html#ndbparam-mgmd-id)`: Number identifying management node. Now deprecated; use NodeId instead.

* `[LogDestination](mysql-cluster-mgm-definition.html#ndbparam-mgmd-logdestination)`: Where to send log messages: console, system log, or specified log file.

* `[NodeId](mysql-cluster-mgm-definition.html#ndbparam-mgmd-nodeid)`: Number uniquely identifying management node among all nodes in cluster.

* `[PortNumber](mysql-cluster-mgm-definition.html#ndbparam-mgmd-portnumber)`: Port number to send commands to and fetch configuration from management server.

* `[PortNumberStats](mysql-cluster-mgm-definition.html#ndbparam-mgmd-portnumberstats)`: Port number used to get statistical information from management server.

* `[TotalSendBufferMemory](mysql-cluster-mgm-definition.html#ndbparam-mgmd-totalsendbuffermemory)`: Total memory to use for all transporter send buffers.

* `[wan](mysql-cluster-mgm-definition.html#ndbparam-mgmd-wan)`: Use WAN TCP setting as default.

Note

 After making changes in a management node's configuration, it is necessary to perform a rolling restart of the cluster for the new configuration to take effect. See [Section 23.4.3.5, “Defining an NDB Cluster Management Server”](mysql-cluster-mgm-definition.html), for more information.

 To add new management servers to a running NDB Cluster, it is also necessary perform a rolling restart of all cluster nodes after modifying any existing `config.ini` files. For more information about issues arising when using multiple management nodes, see [Section 23.2.7.10, “Limitations Relating to Multiple NDB Cluster Nodes”](mysql-cluster-limitations-multiple-nodes.html).

