Bug 1027772

Summary:	[RFE] add possibility to reserve memory for VM in a cluster when it is not running
Product:	[oVirt] ovirt-engine	Reporter:	David Jaša <djasa>
Component:	RFEs	Assignee:	Nobody <nobody>
Status:	CLOSED WONTFIX	QA Contact:	Shira Maximov <mshira>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	---	CC:	bugs, lpeer, mshira, rbalakri, Rhev-m-bugs, srevivo
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---	Flags:	ylavi: ovirt-future? rule-engine: planning_ack? rule-engine: devel_ack? rule-engine: testing_ack?
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-06-26 16:12:50 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	SLA	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1027697
Bug Blocks:

Description David Jaša 2013-11-07 11:56:38 UTC

Description of problem:
In mixed-use clusters, administrator may want to reserve some resources for important VMs so that they might run anytime, regardless of level of use by less important VMs. The tightest bottleneck IMO is memory so this RFE is centered around this resource. The result should be that if the VM with such reserved memory configured is not running, engine should make sure that there is enough free memory on some host to run the VM (with the catch that if there are more such VMs in the cluster, the free memory on host must align with requirements of VMs - say if there are three VMs with 2 GB reserved each on 2-node cluster with 6 GB of free RAM, the free memory has to be 4 + 2 or 2 + 4 GB, not 3 + 3 GB).

Configuration-wise, there are more possible approaches how to configure this:
  * reserve equivalent of Physical Memory Guaranteed automatically for HA VMs
  * add a checkbox next to Physical Memory Guaranteed that would reserve the same amount when the VM is off
  * add Reserved Memory next to Physical Memory Guaranteed


Version-Release number of selected component (if applicable):
3.3

How reproducible:


Steps to Reproduce:
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Comment 1 Scott Herold 2014-01-13 16:17:32 UTC

We are implementing HA Reservations in 3.4 under BZ 1027697.  We want to implement the HA reservation policy, then look to extend to additional use cases such as reservations for Powered Off VMs.

Comment 2 Martin Sivák 2018-06-26 16:12:50 UTC

It has been years since this was opened and it never spiked any interest. Closing for now. Please reopen with justification if it is important for you.