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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "DataNode" by GridEngine
Date Sat, 10 Sep 2011 05:18:26 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "DataNode" page has been changed by GridEngine:
http://wiki.apache.org/hadoop/DataNode?action=diff&rev1=2&rev2=3

Comment:
be specific

  
  DataNode instances can talk to each other, which is what they do when they are replicating
data. 
  
-  * There is usually  no need to use RAID storage for DataNode data, because it is all designed
to be replicated across multiple servers, rather than multiple disks on the same server. 
+  * There is usually  no need to use RAID storage for DataNode data, because data is designed
to be replicated across multiple servers, rather than multiple disks on the same server. 
-  * An ideal configuration is for a server to have a DataNode, a TaskTracker, and then physical
disks  one TaskTracker slot per CPU. This will allow  every TaskTracker 100% of a CPU, and
separate disks to read and write data.
+  * An ideal configuration is for a server to have a DataNode, a TaskTracker, and then physical
disks one TaskTracker slot per CPU. This will allow  every TaskTracker 100% of a CPU, and
separate disks to read and write data.
   * Avoid using [[NFS]] for data storage in production system.
  

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