[Bugs] [Bug 1206546] New: Data Tiering:Need a way from CLI to identify hot and cold tier bricks easily

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1206546

            Bug ID: 1206546
           Summary: Data Tiering:Need a way from CLI to identify hot and
                    cold tier bricks easily
           Product: GlusterFS
           Version: mainline
         Component: core
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: nchilaka at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
======================
Currently there is no easy way of identifying hot and cold tier bricks easily
from the CLI commands like volume info or volume status.
If at all the user wants to know which brick belongs to which tier, he/she
needs to issue a getfattr to see the tier hash value, which is cumbersome.
It would be ideal to display the tiers and the respective bricks in the volume
info command output itself.
For eg, the current o/p of "volume info " of a  distribute tiered volume is as
below:
[root at rhs-client44 ~]# gluster v info tiervol10

Volume Name: tiervol10
Type: Tier
Volume ID: e6223c16-50fa-4916-b8b9-a83db6e8ec6c
Status: Started
Number of Bricks: 5 x 1 = 5
Transport-type: tcp
Bricks:
Brick1: rhs-client37:/pavanbrick2/tiervol10/hb1
Brick2: rhs-client44:/pavanbrick2/tiervol10/hb1
Brick3: rhs-client44:/pavanbrick1/tiervol10/b1
Brick4: rhs-client37:/pavanbrick1/tiervol10/b1
Brick5: rhs-client38:/pavanbrick1/tiervol10/b1


I would suggest something like below should be o/p:
[root at rhs-client44 ~]# gluster v info tiervol10

Volume Name: tiervol10
Type: Tier
Volume ID: e6223c16-50fa-4916-b8b9-a83db6e8ec6c
Status: Started
Number of Bricks: 5 x 1 = 5
Transport-type: tcp

Bricks:
HOT TIER:
Brick1: rhs-client37:/pavanbrick2/tiervol10/hb1
Brick2: rhs-client44:/pavanbrick2/tiervol10/hb1

COLD TIER:
Brick1: rhs-client44:/pavanbrick1/tiervol10/b1
Brick2: rhs-client37:/pavanbrick1/tiervol10/b1
Brick3: rhs-client38:/pavanbrick1/tiervol10/b1



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 reproducible


Steps to Reproduce:
1.create a distribute volume
2.attach a tier using attach-tier to the volume
3.issue a volume info or volume status command

Actual results:
==============
No easy way to identify cold/hot tier bricks


Expected results:
================
Enhance the volume info o/p to display hot and cold bricks dedicatedly.

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