Bug 1249045 – [GSS] Add a use-case for the CRUSH OSD tunable "osd crush update on start" in RHCS1.2.3 Storage Strategies documentation

Bug 1249045 - [GSS] Add a use-case for the CRUSH OSD tunable "osd crush update on start" in RHCS1.2.3 Storage Strategies documentation

Summary:	[GSS] Add a use-case for the CRUSH OSD tunable "osd crush update on start" in...

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Ceph Storage
Classification:	Red Hat
Component:	Documentation (Show other bugs)
Sub Component:
Version:	1.3.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	rc
Target Release:	1.3.2
Assigned To:	John Wilkins
QA Contact:	ceph-qe-bugs
Docs Contact:

URL:
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Keywords:	Documentation, ZStream

Depends On:	1299978
Blocks:
	Show dependency tree / graph

Reported:	2015-07-31 08:26 EDT by Vimal Kumar
Modified:	2016-02-23 06:26 EST (History)
CC List:	7 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
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Environment:
Last Closed:	2016-02-23 06:26:08 EST
Type:	Bug
Regression:	---
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Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Vimal Kumar 2015-07-31 08:26:50 EDT

a) Description of problem:

Add a use-case for the CRUSH OSD tunable "osd crush update on start" under the section "1.1. ceph-crush-location hook" in RHCS1.2.3 Storage Strategies documentation.

If a user sets a custom hostname for an OSD node in CRUSH map, and the OSD process or the node is restarted, the CRUSH maps get reverted back to the initial state. This makes the custom settings vanish.

In order to overcome this, set "osd crush update on start = false" in /etc/ceph/ceph.conf and push the configuration to the OSD/MON nodes with :

# ceph-deploy --overwrite-conf config push <node1> <node2> ... <nodeN>

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

RHCS1.2.3 Storage Strategies documentation.

NOTE: Editing a crush map and setting custom hostnames for rulesets and buckets are something customers do usually. The Crush map will revert back to the default as per the OSD hierarchy, if this tunable is not set. We need to get this added as a use-case.

Comment 2 John Wilkins 2015-09-15 13:08:57 EDT

Added clarifying language and use case here: 

https://gitlab.cee.redhat.com/jowilkin/red-hat-ceph-storage-strategies-guide/commit/5e9ac01e9c034fc814016f5481dcb1fb602028c0

I also added the setting in the Quick Start with a link back to the storage strategies guide here: 

https://gitlab.cee.redhat.com/jowilkin/red-hat-ceph-storage-installation-guide-rhel/commit/fefaa1c2b8d6242e56736d4bf1338b00a8c44b3d

And added the link here:

https://gitlab.cee.redhat.com/jowilkin/red-hat-ceph-storage-installation-guide-rhel/commit/38565348b1cc2c805945f555e2535ed6e4ccb813

Comment 4 Rachana Patel 2016-01-20 09:51:19 EST

3. bug summary says, add option in Storage strategy Document. As per comment#2 it is also being added in Installation Quick guide

Comment 6 John Wilkins 2016-02-01 18:49:09 EST

https://gitlab.cee.redhat.com/red-hat-ceph-storage-documentation/doc-Red_Hat_Ceph_Storage_1.3-Installation_Guide_for_Red_Hat_Enterprise_Linux/commit/84838fd0b076b158fe2046b9f89a02ca25a364e7

Comment 7 John Wilkins 2016-02-18 11:55:44 EST

I've removed the comment from the storage strategies guide for  now.

https://gitlab.cee.redhat.com/red-hat-ceph-storage-documentation/doc-Red_Hat_Ceph_Storage_1.3-Storage_Strategies/commit/ffeef31e155d49ceefe2d7d934a39be289fc70e4

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