Karthik Kambatla commented on YARN-2139:

It is very similar to vcores. vdisks is the number of virtual disks, no metric 
just a number. 

If we want to allow upto 'n' tasks to share a disk, {{vdisks = n * num-disks}}. 
For cases with n > 1, spindle locality will help with ensuring all the 'n' 
vdisks correspond to the same spindle(s). 

> [Umbrella] Support for Disk as a Resource in YARN 
> --------------------------------------------------
>                 Key: YARN-2139
>                 URL: https://issues.apache.org/jira/browse/YARN-2139
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Wei Yan
>         Attachments: Disk_IO_Scheduling_Design_1.pdf, 
> Disk_IO_Scheduling_Design_2.pdf, YARN-2139-prototype-2.patch, 
> YARN-2139-prototype.patch
> YARN should consider disk as another resource for (1) scheduling tasks on 
> nodes, (2) isolation at runtime, (3) spindle locality. 

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