how can I increase hdfs capacity

Question

How can I increase the configured capacity of my hadoop DFS from the default 50GB to 100GB?

My present setup is hadoop 1.2.1 running on a centOS6 machine with 120GB

Answer 1

Stop all the service: stop-all.sh

then add these properties in terms of increasing the storage size in hdfs-site.xml:

---

    
        dfs.disk.balancer.enabled
        true


        dfs.storage.policy.enabled
        true


        dfs.blocksize
        134217728


        dfs.namenode.handler.count
        100

 
         dfs.namenode.name.dir
         file:///usr/local/hadoop_store/hdfs/namenode


dfs.datanode.data.dir
file:///usr/local/hadoop_store/hdfs/datanode,[disk]file:///hadoop_store2/hdfs/datanode
 

---

also remember to put [disk] for including a extra disk on folder, [ssd] for dedicated extra ssd drive. always remember to check the "///" triple "/" for the directory pointing.

After that,

format the namenode to get the settings inherited in the Hadoop cluster, by giving a command

hadoop namenode -format then start the services from beginning: Start-all.sh

"/* remember without formating the hdfs the setting will not be activated as it will search for the Blockpool Id (BP_ID) in dfs.datanode.data.dir, and for the new location it will not found any BP_ID. "/*