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Bug 1228446

Summary:	[Docs] [Nova] Add a description of the new IO Ops weighter
Product:	Red Hat OpenStack	Reporter:	Andrew Dahms <adahms>
Component:	documentation	Assignee:	Radek Bíba <rbiba>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Don Domingo <ddomingo>
Severity:	medium	Docs Contact:
Priority:	high
Version:	7.0 (Kilo)	CC:	ddomingo, sbauza, slong, yeylon
Target Milestone:	ga	Keywords:	Documentation
Target Release:	7.0 (Kilo)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-12-02 12:05:18 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:
Bug Depends On:	1112467
Bug Blocks:	1234669

Description Andrew Dahms 2015-06-05 01:29:17 UTC

In RHEL-OSP 7.0, a new weighter that filters hosts in accordance with IO ops is now available, and must be documented.

BluePrint - https://blueprints.launchpad.net/nova/+spec/io-ops-weight

This weighter must be described in "3.5.2.1. Configure Weight Options for Hosts" in the Administration Guide to be pulled over to the "Managing Instances and Images" guide when that guide is ready.

Comment 3 Andrew Dahms 2015-06-05 03:25:36 UTC

Assigning to Radek for review.

Radek - this is another Nova bug, and the changes can be applied to the content in the Administration Guide for now.

Comment 4 Radek Bíba 2015-06-08 11:34:25 UTC

Russell,

Is the following description technically correct?

 * nova.scheduler.weights.io_ops - Weighs the host's workload.
...
Weigher:io_ops 
Option: [DEFAULT] io_ops_weight_multiplier
Description: Filters hosts by their I/O load (floating point). By default, io_ops_weight_multiplier=-1.0. If using a negative number, hosts with a lighter workload are given preference. A positive number prioritizes hosts with a heavier workload.

Anything more you would add to the docs?

Comment 5 Russell Bryant 2015-06-08 13:43:19 UTC

sbauza is the best person to ask for review of scheduler features

Comment 6 Sylvain Bauza 2015-06-18 07:37:43 UTC

Hey Radek,

That's correct, as it's a weigher, it will prefer the hosts having the less IO Ops if the multiplier is negative.

Comment 8 Andrew Dahms 2015-06-19 00:11:23 UTC

*** Bug 1175965 has been marked as a duplicate of this bug. ***

Comment 9 Andrew Dahms 2015-06-19 00:13:13 UTC

Assigning Don as the QA contact.

Don, could you take a look at the newly added content?

Comment 10 Don Domingo 2015-06-24 01:37:15 UTC

New entry for io_ops is good to go; merged.

Comment 11 Andrew Dahms 2015-12-02 12:05:18 UTC

This content is now live on the Customer Portal.

Closing.