Varun Vasudev commented on YARN-2618:

[~kasha], [~ywskycn] - question on "vdisks". What is the expected difference 
between a container with 1 vdisk and one with 2 vdisks? Is it that the second 
gets a higher proportion of disk operations or is it meant to imply a greater 
number of spindles? Sorry if the question seems very basic - I've gone through 
the parent ticket but I'd like to understand the term independent of the 
enforcement mechanism.

> Avoid over-allocation of disk resources
> ---------------------------------------
>                 Key: YARN-2618
>                 URL: https://issues.apache.org/jira/browse/YARN-2618
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>         Attachments: YARN-2618-1.patch, YARN-2618-2.patch
> Subtask of YARN-2139. 
> This should include
> - Add API support for introducing disk I/O as the 3rd type resource.
> - NM should report this information to the RM
> - RM should consider this to avoid over-allocation

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