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Hi Chris,

Actually, the system does not belong to us therefore we only had the log file. But it seems reasonable that besides the size of ephemeral diisk in _base, we also have the image of vm downloaded from Glance that consumes the disk capacity. That can make the strange value of disk_over_commit.

I will check this situation later. Btw, thank you for your help.

Tuan

-----Original Message-----
From: Chris Friesen [mailto:chris.friesen at windriver.com] 
Sent: August 04, 2016 15:57
To: openstack-dev at lists.openstack.org
Subject: Re: [openstack-dev] [Nova] Nova compute reports the disk usage

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


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