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Bug 1529967

Summary:	Live migration doesn't consider over commit ratio
Product:	Red Hat OpenStack	Reporter:	David Hill <dhill>
Component:	openstack-nova	Assignee:	Matthew Booth <mbooth>
Status:	CLOSED ERRATA	QA Contact:	Archit Modi <amodi>
Severity:	high	Docs Contact:
Priority:	high
Version:	8.0 (Liberty)	CC:	amodi, asoni, berrange, ccollett, dasmith, dhill, eglynn, jhakimra, kchamart, mbooth, sbauza, sferdjao, sgordon, srevivo, vromanso
Target Milestone:	zstream	Keywords:	Triaged, ZStream
Target Release:	8.0 (Liberty)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	openstack-nova-12.0.6-22.el7ost	Doc Type:	Bug Fix
Doc Text:	Previously, when doing a live migration to a destination compute host with RAM overcommit enabled, a pre-live migration check did not consider the configured overcommit ratio when deciding if enough RAM was available. Consequently, the live migration would fail with the following error in the logs: "MigrationPreCheckError: Migration pre-check error: Unable to migrate <instance uuid> to <destination host>: Lack of memory(host:336 <= instance:512)" With this update, the pre-live migration check has been updated to take configured overcommit into account. As a result, the live migration will now succeed as long as the destination compute will not exceed the configured overcommit ratio.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-03-15 12:35:20 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description David Hill 2017-12-31 14:22:26 UTC

Description of problem:
Live migration doesn't consider over commit ratio of the compute host and this is fixed upstream [1].  Would it be possible to backport that commit [2] ?

[1] https://bugs.launchpad.net/nova/+bug/1214943
[2] https://git.openstack.org/cgit/openstack/nova/commit/?id=f5e35dcfe8ee586106438bcfa551426babc75bf6

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Live migrate VMs to over allocated nodes.
2.
3.

Actual results:
Fails

Expected results:
Succeeds

Additional info:

Comment 1 Matthew Booth 2018-01-05 11:45:34 UTC

This bug is relevant to OSP8, its dependencies are met there, and it backports cleanly.

The fix is already present in OSP9 onwards.

Comment 13 errata-xmlrpc 2018-03-15 12:35:20 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0529