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[Rikimaru Honjo <honjo.rikimaru@xxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
disk_available_least is a free disk size information of hypervisors.
This is calculated by the following formula:

disk_available_least = <free disk size> - <Total gap between virtual
disk size and actual disk size for all instances>

But stopped instance's virtual disk sizes are not calculated now.
So disk_available_least will be larger than actual free disk size.
As a result, instances will be scheduled beyond the actual free disk size if stopped instances are on a host.

I think that this is a bug.
Because stopped instances are on a host unlike shelved instances.

Steps to reproduce
==================
1. Call hyper visor show API for any hypervisor.
   And, check the value of disk_available_least.
2. Create a instance with qcow2 image on 1's hypervisor.
3. Wait for over 1 minute.
4. Call hyper visor show API.
   And, check that disk_available_least is smaller than step 1's value.
5. Call Stop Server API for the instance.
6. Wait until instance's state is changed to STOPPED.
7. Wait for over 1 minute.
8. Call hyper visor show API.
   And, check the value of disk_available_least.

Expected result
===============
disk_available_least value is same as step 8.
Because stopped instance is still on the host.

Actual result
=============
disk_available_least value is bigger than step4's value in step 8.

Environment
===========
* I used latest devstack.
* I used libvirt + kvm.
* I used qcow2 image.

Logs & Configs
==============
I think that this bug affects for all settings.

** Affects: nova
     Importance: Undecided
     Assignee: Rikimaru Honjo (honjo-rikimaru-c6)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Rikimaru Honjo (honjo-rikimaru-c6)

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https://bugs.launchpad.net/bugs/1693679

Title:
  Stopped instance's disk sizes are not calculated for
  disk_available_least

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Description
  ===========
  disk_available_least is a free disk size information of hypervisors.
  This is calculated by the following formula:

  disk_available_least = <free disk size> - <Total gap between virtual
  disk size and actual disk size for all instances>

  But stopped instance's virtual disk sizes are not calculated now.
  So disk_available_least will be larger than actual free disk size.
  As a result, instances will be scheduled beyond the actual free disk size if stopped instances are on a host.

  I think that this is a bug.
  Because stopped instances are on a host unlike shelved instances.

  Steps to reproduce
  ==================
  1. Call hyper visor show API for any hypervisor.
     And, check the value of disk_available_least.
  2. Create a instance with qcow2 image on 1's hypervisor.
  3. Wait for over 1 minute.
  4. Call hyper visor show API.
     And, check that disk_available_least is smaller than step 1's value.
  5. Call Stop Server API for the instance.
  6. Wait until instance's state is changed to STOPPED.
  7. Wait for over 1 minute.
  8. Call hyper visor show API.
     And, check the value of disk_available_least.

  Expected result
  ===============
  disk_available_least value is same as step 8.
  Because stopped instance is still on the host.

  Actual result
  =============
  disk_available_least value is bigger than step4's value in step 8.

  Environment
  ===========
  * I used latest devstack.
  * I used libvirt + kvm.
  * I used qcow2 image.

  Logs & Configs
  ==============
  I think that this bug affects for all settings.

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