Adding NDB Cluster Data Nodes Online ) ENGINE NDBCLUSTER; [ndbd default] DataMemory = 100M IndexMemory = 100M NoOfReplicas = 2 DataDir = /usr/local/mysql/var/mysql-cluster [ndbd] Id = 1 HostName = 198.51.100.1 [ndbd] Id = 2 HostName = 198.51.100.2 [ndbd] Id = 3 HostName = 198.51.100.3 [ndbd] Id = 4 HostName = 198.51.100.4 [mgm] HostName = 198.51.100.10 Id = 10 [api] Id=20 HostName = 198.51.100.20 [api] Id=21 HostName = 198.51.100.21 ndb_mgm>  10 STOP Node 10 has shut down. Disconnecting to allow Management Server to shutdown shell> The memory usage and related information shown later in this section was generated after inserting approximately 50000 rows into this table. In this example, we show the single-threaded  ndbd  being used for the data node processes. You can also apply this example, if you are using the multithreaded ndbmtd  by substituting  ndbmtd  for  ndbd  wherever it appears in the steps that follow. Step 1: Update configuration file.   Open the cluster global configuration file in a text editor and add  [ndbd]  sections corresponding to the 2 new data nodes. (We give these data nodes IDs 3 and 4, and assume that they are to be run on host machines at addresses 198.51.100.3 and 198.51.100.4, respectively.) After you have added the new sections, the contents of the  config.ini  file should look like what is shown here, where the additions to the file are shown in bold type: Once you have made the necessary changes, save the file. Step 2: Restart the management server.   Restarting the cluster management server requires that you issue separate commands to stop the management server and then to start it again, as follows: Note 1. Stop the management server using the management client  STOP  command, as shown here: 4484