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https://issues.apache.org/jira/browse/HDFS-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349820#comment-14349820
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Vinod Kumar Vavilapalli commented on HDFS-7896:
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Is the health-script stuff present in YARN helpful for this? YARN-2980 is a 
prereq if it is.

> HDFS Slow disk detection
> ------------------------
>
>                 Key: HDFS-7896
>                 URL: https://issues.apache.org/jira/browse/HDFS-7896
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Arpit Agarwal
>
> HDFS should detect slow disks. To start with we can flag this information via 
> the NameNode web UI. Alternatively DNs can avoid using slow disks for writes.



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