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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "FAQ" by SomeOtherAccount
Date Fri, 22 Oct 2010 16:02:05 GMT
Dear Wiki user,

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

The "FAQ" page has been changed by SomeOtherAccount.
http://wiki.apache.org/hadoop/FAQ?action=diff&rev1=82&rev2=83

--------------------------------------------------

  export HADOOP_IDENT_STRING=`/usr/xpg4/bin/id -u -n`
  }}}
  
+ === Reported disk capacities are wrong ===
+ 
+ Hadoop uses du and df to determine disk space used.  On pooled storage systems that report
total capacity of the entire pool (such as ZFS) rather than the filesystem, Hadoop gets easily
confused.  Users have reported that using fixed quota sizes for HDFS and MapReduce directories
helps eliminate a lot of this confusion.
+ 

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