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https://issues.apache.org/jira/browse/HDFS-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977473#action_12977473
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Konstantin Shvachko commented on HDFS-1564:
-------------------------------------------

dfs.datanode.du.reserved is per volume. Here is the description from 
hdfs-default.xml:
{code}
<property>
  <name>dfs.datanode.du.reserved</name>
  <value>0</value>
  <description>Reserved space in bytes per volume. Always leave this much space 
free for non dfs use.
  </description>
</property>
{code}
Also if you look in the code the property is used in FSVolume, which 
corresponds to one volume.
Or do I miss what this is about?

> Make dfs.datanode.du.reserved configurable per volume
> -----------------------------------------------------
>
>                 Key: HDFS-1564
>                 URL: https://issues.apache.org/jira/browse/HDFS-1564
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node
>            Reporter: Aaron T. Myers
>            Priority: Minor
>
> In clusters with DNs which have heterogeneous data dir volumes, it would be 
> nice if dfs.datanode.du.reserved could be configured per-volume.

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