Formatting the namenode

[Phantom]

Hi

When I format my namenode it does format the directory specified under
dfs.name.dir. However there is a folder under /tmp called hadoop-alakshman.
What is this for ? Will all blocks be stored under /var/hadoop somewhere.
Here is a copy of hadoop-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
       <property>
               <name>dfs.name.dir</name>
               <value>/var/hadoop</value>
       </property>

       <property>
               <name>fs.default.name</name>
               <value>hdfs://hadoop001.sf2p.com:9000</value>
       </property>

       <property>
               <name>mapred.job.tracker</name>
               <value>hadoop001.sf2p.com:50029</value>
       </property>

       <property>
               <name>mapred.job.tracker.info.port</name>
               <value>50030</value>
       </property>

       <property>
               <name>mapred.child.java.opts</name>
               <value>-Xmx1024M</value>
       </property>

       <property>
               <name>mapred.min.split.size</name>
               <value>65536</value>
       </property>

       <property>
               <name>dfs.replication</name>
               <value>3</value>
       </property>

</configuration>