Make DN minimum valid volumes configurable
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                 Key: HDFS-1161
                 URL: https://issues.apache.org/jira/browse/HDFS-1161
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
    Affects Versions: 0.22.0
            Reporter: Eli Collins
            Assignee: Eli Collins
             Fix For: 0.22.0


The minimum number of non-faulty volumes to keep the DN active is hard-coded to 
1.  It would be useful to allow users to configure this value so the DN can be 
taken offline when eg half of its disks fail, otherwise it doesn't get reported 
until it's down to it's final disk and suffering degraded performance.

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