[root@hadoop01 hadoop-0.21]# ./bin/start-dfs.sh
starting namenode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-namenode-hadoop01.local.out
hadoop03.local: starting datanode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-datanode-hadoop03.local.out
hadoop01.local: starting datanode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-datanode-hadoop01.local.out
hadoop04.local: starting datanode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-datanode-hadoop04.local.out
hadoop02.local: starting datanode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-datanode-hadoop02.local.out
hadoop01.local: starting secondarynamenode, logging to /opt/hadoop-0.21/bin/../logs/hadoop-root-secondarynamenode-hadoop01.local.out