Bug 1206553

Summary:	Data Tiering:Need to allow detaching of cold tier too
Product:	[Community] GlusterFS	Reporter:	Nag Pavan Chilakam <nchilaka>
Component:	tiering	Assignee:	Joseph Elwin Fernandes <josferna>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	mainline	CC:	bugs, gluster-bugs, sankarshan, ssaha
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-30 15:09:56 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:	1260923

Description Nag Pavan Chilakam 2015-03-27 12:09:59 UTC

Description of problem:
======================
Currently detach-tier command directly detaches the hot tier(infact the tier which is attached later).
But there may be scenarios where the customer wants to detach cold-tier.
Say for example they want to replace the old disks in cold tier.



Version-Release number of selected component (if applicable):
============================================================
3.7 upstream nightlies build http://download.gluster.org/pub/gluster/glusterfs/nightly/glusterfs/epel-6-x86_64/glusterfs-3.7dev-0.803.gitf64666f.autobuild/

glusterfs 3.7dev built on Mar 26 2015 01:04:24


How reproducible:
===============
easily

Steps to Reproduce:
==================
1.create a gluster volume of type distribute
2.attach a tier to the volume using attach-tier. 
3. Now check the volume type. It would show as a tiered volume.
4. Now issue a detach-tier will just detach the tier previously attached.
 User can't choose if he/she wants to attach or detach a cold/hot tier



Expected results:
================
Leave it to the user to choose if they want to detach cold or hot tier.

Comment 1 Sayan Saha 2015-03-30 15:09:56 UTC

Detaching the cold tier is not a requirement for this feature. Users have other means to change old disks or do a maintenance on volumes.