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Bug 1249045

Summary: [GSS] Add a use-case for the CRUSH OSD tunable "osd crush update on start" in RHCS1.2.3 Storage Strategies documentation
Product: [Red Hat Storage] Red Hat Ceph Storage Reporter: Vimal Kumar <vikumar>
Component: DocumentationAssignee: John Wilkins <jowilkin>
Status: CLOSED NOTABUG QA Contact: ceph-qe-bugs <ceph-qe-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 1.3.0CC: asriram, hnallurv, jowilkin, kdreyer, ngoswami, racpatel, vikumar
Target Milestone: rcKeywords: Documentation, ZStream
Target Release: 1.3.2   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-02-23 11:26:08 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: 1299978    
Bug Blocks:    

Description Vimal Kumar 2015-07-31 12:26:50 UTC 
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 17:08:57 UTC 
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 14:51:19 UTC 
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 23:49:09 UTC 
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 16:55:44 UTC 
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