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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "NameNode" by SteveLoughran
Date Wed, 06 Aug 2008 09:55:35 GMT
Dear Wiki user,

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

The following page has been changed by SteveLoughran:
http://wiki.apache.org/hadoop/NameNode

------------------------------------------------------------------------------
  It is essential to look after the NameNode. Here are some recommendations from production
use
  
   * Use a good server with lots (15GB+) of RAM.
-  * Use fast RAID5 storage for keeping the index.
+  * Consider using fast RAID5 storage for keeping the index.
+  * List more than one name node directory in the configuration, so that multiple copies
of the indices will be stored. As long as the directories are on separate disks, a single
full disk will not corrupt the index.
   * Configure the name node to store one set of transaction logs on a separate disk from
the index. 
   * Configure the name node to store another set of transaction logs to a network mounted
disk.  
   * Monitor the disk space available to the NameNode. If is getting low, add more storage.

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