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https://issues.apache.org/jira/browse/HDFS-15549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192644#comment-17192644
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Leon Gao commented on HDFS-15549:
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[~jianghuazhu] I think this will depend on the implementation of HDFS-15548

> Improve DISK/ARCHIVE movement if they are on same filesystem
> ------------------------------------------------------------
>
>                 Key: HDFS-15549
>                 URL: https://issues.apache.org/jira/browse/HDFS-15549
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Leon Gao
>            Assignee: Leon Gao
>            Priority: Major
>
> When moving blocks between DISK/ARCHIVE, we should prefer the volume on the 
> same underlying filesystem and use "rename" instead of "copy" to save IO.



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