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Bug 1489063

Summary:	backport: increase min_in_ratio to .75 (from .3)
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Sage Weil <sweil>
Component:	RADOS	Assignee:	Josh Durgin <jdurgin>
Status:	CLOSED ERRATA	QA Contact:	Manohar Murthy <mmurthy>
Severity:	high	Docs Contact:	Bara Ancincova <bancinco>
Priority:	unspecified
Version:	2.4	CC:	anharris, ceph-eng-bugs, dzafman, hnallurv, jdurgin, kchai, kdreyer, vumrao
Target Milestone:	rc
Target Release:	2.5
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	RHEL: ceph-10.2.10-1.el7cp Ubuntu: ceph_10.2.10-2redhat1xenial	Doc Type:	Enhancement
Doc Text:	.The default value for the `min_in_ratio` option has been increased to `0.75` The `min_in_ratio` option prevents Monitors from marking OSDs as `out` when the amount of `out` OSDs drops below certain fraction of all OSDs in the cluster. In previous releases, the default value of `min_in_ratio` was set to `0.3`. With this update, the value has been increased to `0.75`.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-02-21 19:43:32 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:
Bug Blocks:	1536401

Description Sage Weil 2017-09-06 15:57:00 UTC

Description of problem:

The min in ratio prevents the mon from marking OSDs out once we drop below some fraction of the total OSDs in the system.  This prevents too many PGs from piling up on the surviving osds.  This was .3 in hammer and jewel.  In luminous we increased in to .75.

That increase has been backported to upstream jewel in 0412bf2adaf07e527ac6659c9bce0d406edeca93.

Make sure that patch in included in the next downstream 2.y release.

Comment 3 Ken Dreyer (Red Hat) 2018-01-02 21:25:59 UTC

Fix is in Ceph v10.2.10 upstream

Comment 10 errata-xmlrpc 2018-02-21 19:43:32 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-2018:0340