NDB Cluster Configuration Files not specified, then  FileSystemPathDD  is used (or  FileSystemPath , if  FileSystemPathDD  has also not been set). If a  FileSystemPathUndoFiles  directory is specified for a given data node (including the case where the parameter is specified in the  [ndbd default]  section of the  config.ini  file), then starting that data node with  --initial  causes all files in the directory to be deleted. For more information, see Section 23.5.10.1, “NDB Cluster Disk Data Objects” . • Disk Data object creation parameters.   The next two parameters enable you—when starting the cluster for the first time—to cause a Disk Data log file group, tablespace, or both, to be created without the use of SQL statements. • InitialLogFileGroup Version (or later) NDB 8.0.13 Type or units string Default [see documentation] Range ... Restart Type S (NDB 8.0.13) This parameter can be used to specify a log file group that is created when performing an initial start of the cluster.  InitialLogFileGroup  is specified as shown here: The  name  of the log file group is optional and defaults to  DEFAULT-LG . The  undo_buffer_size is also optional; if omitted, it defaults to  64M . Each  file-specification  corresponds to an undo log file, and at least one must be specified in the  file-specification-list . Undo log files are placed according to any values that have been set for  FileSystemPath ,  FileSystemPathDD , and FileSystemPathUndoFiles , just as if they had been created as the result of a  CREATE LOGFILE GROUP  or  ALTER LOGFILE GROUP  statement. Consider the following: This is equivalent to the following SQL statements: 4144 InitialLogFileGroup = [name= name ;] [undo_buffer_size= size ;]  file-specification-list file-specification-list : file-specification [;  file-specification [; ...]] file-specification : filename : size InitialLogFileGroup = name=LG1; undo_buffer_size=128M; undo1.log:250M; undo2.log:150M CREATE LOGFILE GROUP LG1 ADD UNDOFILE ’undo1.log’ INITIAL_SIZE 250M UNDO_BUFFER_SIZE 128M ENGINE NDBCLUSTER; ALTER LOGFILE GROUP LG1 ADD UNDOFILE ’undo2.log’ INITIAL_SIZE 150M