Hi,

I have installed hadoop cluster . I tried to add other drives in hdfs but
didn't get success. I tried to add  following parameter in
/etc/hadoop/conf/hdfs-site.xml. but it is not working i get service

  <property>
     <name>dfs.datanode.data.dir</name>
<!--     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value> -->
  <value>/mnt/san1/hdfs/${user.name}/dfs/data,/mnt/san2/hdfs/${user.name
}/dfs/data,/mnt/san3/hdfs/${user.name}/dfs/data,/mnt/san4/hdfs/${user.name
}/dfs/data</value>
  </property>

]# for service in /etc/init.d/hadoop-hdfs-* ; do $service status; done
Hadoop datanode is running                                 [  OK  ]
Hadoop namenode is dead and pid file exists                [FAILED]
Hadoop secondarynamenode is running                        [  OK  ]
Logs

# tail -n 30 hadoop-hdfs-namenode-OPERA-MAST1.log
2012-12-27 13:04:42,526 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner             hdfs (auth:SIMPLE)
2012-12-27 13:04:42,526 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup          hadmin
2012-12-27 13:04:42,526 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled true
2012-12-27 13:04:42,526 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: HA Enabled: false
2012-12-27 13:04:42,528 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Append Enabled: true
2012-12-27 13:04:42,555 INFO
org.apache.hadoop.hdfs.server.namenode.NameNode: Caching file names
occuring more than 10 times
2012-12-27 13:04:42,559 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
dfs.namenode.safemode.threshold-pct = 0.9990000128746033
2012-12-27 13:04:42,559 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
dfs.namenode.safemode.min.datanodes = 0
2012-12-27 13:04:42,559 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
dfs.namenode.safemode.extension     = 0
2012-12-27 13:04:42,566 INFO org.apache.hadoop.hdfs.server.common.Storage:
Lock on /var/lib/hadoop-hdfs/cache/hdfs/dfs/name/in_use.lock acquired by
nodename [EMAIL PROTECTED]l
2012-12-27 13:04:42,568 INFO
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping NameNode
metrics system...
2012-12-27 13:04:42,568 INFO
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
stopped.
2012-12-27 13:04:42,568 INFO
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system
shutdown complete.
2012-12-27 13:04:42,569 FATAL
org.apache.hadoop.hdfs.server.namenode.NameNode: Exception in namenode join
java.io.IOException: NameNode is not formatted.
        at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:211)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:534)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:424)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:386)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:398)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:432)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:608)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:589)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1140)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1204)
2012-12-27 13:04:42,571 INFO org.apache.hadoop.util.ExitUtil: Exiting with
status 1
2012-12-27 13:04:42,574 INFO
org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at OPERA-MAST1.ny.os.local/172.20.3.119

===================================================

But if i add in following way means one property for one drive then it pick
last drive .

  <property>
     <name>dfs.datanode.data.dir</name>
<!--     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value> -->
  <value>/mnt/san2/hdfs/${user.name}/dfs/data</value>
  </property>
  <property>
     <name>dfs.datanode.data.dir</name>
<!--     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value> -->
  <value>/mnt/san3/hdfs/${user.name}/dfs/data</value>
  </property>
    <property>
     <name>dfs.datanode.data.dir</name>
<!--     <value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value> -->
  <value>/mnt/san4/hdfs/${user.name}/dfs/data</value>
  </property>
Can you please let me know the issue.

Thanks,
Mohit