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On 08/04/2016 02:42 AM, Tuan Luong wrote:
> Hi Chris,
>
> Yes we used qcow image. However I still have something not clear. What I know is that:
>
> - disk_available_least = free_disk - disk_over_commit
> - disk_over_commit = int(virt_size) - physical_disk_size
>
> Before launching:
> - free_disk = 1025
> - disk_available_least = 1016
>
> If we use the normal flavor with 600Gb disk and no ephemeral., the result is good with both above value subtract 600Gb.
> If we use the flavor without disk but 600Gb ephemeral, the result of disk_available_least = -184.

Just a thought...did you clear out the _base directory between tests?  Or is 
there maybe an extra backing file sitting there consuming space?

Chris