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https://issues.apache.org/jira/browse/HDFS-2832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13711356#comment-13711356
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Bikas Saha commented on HDFS-2832:
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Is there an overall design document that one can follow? HDFS-2802 was great in 
this regard with initial docs followed by revisions.
                
> Enable support for heterogeneous storages in HDFS
> -------------------------------------------------
>
>                 Key: HDFS-2832
>                 URL: https://issues.apache.org/jira/browse/HDFS-2832
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 0.24.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>
> HDFS currently supports configuration where storages are a list of 
> directories. Typically each of these directories correspond to a volume with 
> its own file system. All these directories are homogeneous and therefore 
> identified as a single storage at the namenode. I propose, change to the 
> current model where Datanode * is a * storage, to Datanode * is a collection 
> * of strorages. 

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