我在ubuntu14.04上安装了hadoop2.4，现在我正在尝试向现有集群添加一个内部satahd。
我在/mnt/hadoop中安装了新的hd，并将其所有权分配给hadoop用户
然后我尝试将其添加到配置文件中，如下所示：

<configuration>
   <property>
       <name>dfs.replication</name>
       <value>2</value>
   </property>

   <property>
       <name>dfs.name.dir</name>
       <value>file:///home/hadoop/hadoopdata/hdfs/namenode, file:///mnt/hadoop/hadoopdata/hdfs/namenode</value>
   </property>

   <property>
       <name>dfs.data.dir</name>
       <value>file:///home/hadoop/hadoopdata/hdfs/datanode, file:///mnt/hadoop/hadoopdata/hdfs/datanode</value>
   </property>
</configuration>

之后，我启动了hdfs：

Starting namenodes on [localhost]
localhost: starting namenode, logging to /home/hadoop/hadoop/logs/hadoop-hadoop-namenode-hadoop-Datastore.out
localhost: starting datanode, logging to /home/hadoop/hadoop/logs/hadoop-hadoop-datanode-hadoop-Datastore.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /home/hadoop/hadoop/logs/hadoop-hadoop-secondarynamenode-hadoop-Datastore.out

它似乎没有启动第二个硬盘
这是我的core-site.xml

<configuration>
   <property>
       <name>fs.default.name</name>
       <value>hdfs://localhost:9000</value>
   </property>
</configuration>

此外，我尝试刷新namenode，但遇到连接问题：

Refreshing namenode [localhost:9000]
refreshNodes: Call From hadoop-Datastore/127.0.1.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
Error: refresh of namenodes failed, see error messages above.

另外，我无法连接到hadoopweb界面。我似乎有两个相关的问题：

1) A connection problem
 2) I cannot connect to the new installed hd

这些问题是否相关？如何解决这些问题？
谢谢
编辑
我可以ping localhost并访问localhost:50090/status.jsp
但是，我无法访问50030和50070