** Also affects: nova/newton
Importance: Undecided
Status: New
** Also affects: nova/ocata
Importance: Undecided
Status: New
** Changed in: nova/newton
Status: New => In Progress
** Changed in: nova/ocata
Status: New => In Progress
** Changed in: nova/newton
Importance: Undecided => Medium
** Changed in: nova/ocata
Importance: Undecided => Medium
** Changed in: nova/newton
Assignee: (unassigned) => Takashi NATSUME (natsume-takashi)
** Changed in: nova/ocata
Assignee: (unassigned) => Takashi NATSUME (natsume-takashi)
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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):
Fix Released
Status in OpenStack Compute (nova) newton series:
In Progress
Status in OpenStack Compute (nova) ocata series:
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.
When was this bug made?
=======================
Following patch made this bug:
https://review.openstack.org/#/c/105127/
Stopped instance's disk sizes were calculated until merging the above
patch in Juno cycle.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1693679/+subscriptions
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