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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. +
