Overview of NDB Cluster Configuration Parameters, Options, and Variables • NoOfFragmentLogParts : Number of redo log file groups belonging to this data node. • NumCPUs : Specify number of CPUs to use with AutomaticThreadConfig. • PartitionsPerNode : Determines the number of table partitions created on each data node; not used if ClassicFragmentation is enabled. • ThreadConfig : Used for configuration of multithreaded data nodes (ndbmtd). Default is empty string; see documentation for syntax and other information. 23.3.2.2 NDB Cluster Management Node Configuration Parameters 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 23.3.3.5, “Defining an NDB Cluster Management Server” . • ArbitrationDelay : When asked to arbitrate, arbitrator waits this long before voting (milliseconds). • ArbitrationRank : If 0, then management node is not arbitrator. Kernel selects arbitrators in order 1, 2. • DataDir : Data directory for this node. • ExecuteOnComputer : String referencing earlier defined COMPUTER. • ExtraSendBufferMemory : Memory to use for send buffers in addition to any allocated by TotalSendBufferMemory or SendBufferMemory. Default (0) allows up to 16MB. • HeartbeatIntervalMgmdMgmd : Time between management-node-to-management-node heartbeats; connection between management nodes is considered lost after 3 missed heartbeats. • HeartbeatThreadPriority : Set heartbeat thread policy and priority for management nodes; see manual for allowed values. • HostName : Host name or IP address for this management node. • Id : Number identifying management node. Now deprecated; use NodeId instead. • LogDestination : Where to send log messages: console, system log, or specified log file. • NodeId : Number uniquely identifying management node among all nodes in cluster. • PortNumber : Port number to send commands to and fetch configuration from management server. • PortNumberStats : Port number used to get statistical information from management server. • TotalSendBufferMemory : Total memory to use for all transporter send buffers. • 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 23.3.3.5, “Defining an NDB Cluster Management Server” , 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 4039