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Bug 1226859

Summary:	Documentation missing about scaling up from 0 ceph nodes
Product:	Red Hat OpenStack	Reporter:	Amit Ugol <augol>
Component:	documentation	Assignee:	Dan Macpherson <dmacpher>
Status:	CLOSED CURRENTRELEASE	QA Contact:	RHOS Documentation Team <rhos-docs>
Severity:	low	Docs Contact:
Priority:	medium
Version:	7.0 (Kilo)	CC:	dmacpher, hbrock, jason.dobies, jcoufal, jprovazn, kimi.zhang, mburns, nbarcet, rhel-osp-director-maint, srevivo, tvignaud, zbitter
Target Milestone:	ga	Keywords:	Documentation, ZStream
Target Release:	9.0 (Mitaka)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Known Issue
Doc Text:	Scaling up from 0 Ceph Storage nodes is not supported	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-08-02 19:11:35 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:

Description Amit Ugol 2015-06-01 10:13:13 UTC

Description of problem:
On a deployment with no Ceph nodes, issuing overcloud scale stack Cepth-Storage from 0 to any number is trying to scale out Ceph nodes anyway.


Version-Release number of selected component (if applicable):
openstack 1.0.3 and heat 0.5.0

How reproducible:
Always

Steps to Reproduce:
openstack overcloud scale stack -r Ceph-Storage-1 -n 2 overcloud overcloud

Actual results:
Scaling adds Ceph-Storage correctly (status is UPDATE_COMPLETE) but CephStorageNodesPostDeployment failes.
Its now hard to know for certain if "Storage" works correctly.

Expected results:
Error message at least, saying that the system has no Ceph configured so scaling will not be possible.

Additional info:

Comment 4 Giulio Fidente 2015-06-04 15:03:40 UTC

I think the expected behaviour here is that it shouldn't be allowed to scale cephstorage from 0 ? Adding jprovazn on CC.

Comment 5 Jan Provaznik 2015-06-05 10:40:38 UTC

We could add some hardcoded check directly into the scale-out command, but I would lean to just put a note into documentation that scaleup from 0 is not supported for now.

Comment 6 Rafael Rosa 2015-06-15 20:06:06 UTC

Agree with Jan, lets fix the docs for GA and make a permanent fix on 7.1. Re-targeting it and asking for docs.

Comment 8 Jaromir Coufal 2016-01-06 18:42:46 UTC

Moving the proper fix to OSP9

Comment 12 Dan Macpherson 2016-07-29 00:15:11 UTC

Hi Jarda and Mike,

Just saw this BZ. We've got a table indicating what scale scenarios are supported:

https://access.redhat.com/documentation/en/red-hat-openstack-platform/8/paged/director-installation-and-usage/chapter-9-scaling-the-overcloud

Apart from this, is there anything else from the documentation side we need for this BZ?

Comment 13 Jaromir Coufal 2016-08-02 19:11:35 UTC

Nope, it is all covered then.