Description of problem:
=====================
1) Usage: volume remove-brick <VOLNAME> [replica <COUNT>] <BRICK> ... [start|stop|status|commit|force]

remove-brick "commit" can be executed with "force" option or without any option. Hence the Usage should be : 

Usage: volume remove-brick <VOLNAME> [replica <COUNT>] <BRICK> ... [start|stop|status|commit [force]|force]

2) "commit" or "commit force" should not succeed if the remove-brick process is not "started" on the specified bricks of the volume. 

3)  If we want to remove a brick when the volume is not in started state, then we should use the remove-brick command without any option or with "force" option. Hence the error message reported when remove-brick "start" is executed without starting the volume should be changed. 

Message reported: 
==================
gluster v remove-brick vol_dis_rep <BRICK> ... start
volume remove-brick start: failed: Volume vol_dis_rep needs to be started before remove-brick (you can use 'force' or 'commit' to override this behavior)

Expected Message: 
=================
gluster v remove-brick vol_dis_rep <BRICK> ... start
volume remove-brick start: failed: Volume vol_dis_rep needs to be started before remove-brick (you can use 'force' option or execute remove-brick without any option to override this behavior)

Note : remove-brick command without any option points to  remove-brick command with "force" option. 

4) When remove-brick is executed with "commit force" option and if the brick path is not valid, the following is the error message reported: 

Message reported: 
==================
gluster v remove-brick vol_dis_rep rhs-client11:/rhs/bricks/b3 rhs-client12:/rhs/bricks/b3-rep1 start force
wrong brick type: start, use <HOSTNAME>:<export-dir-abs-path>
Usage: volume remove-brick <VOLNAME> [replica <COUNT>] <BRICK> ... [start|stop|status|commit|force]

Here the brick path is not valid. But the message reported is "wrong brick type" 

Expected message:
==================
volume remove-brick commit force: failed: Incorrect brick rhs-client13:/rhs/bricks/vol-rep-b3 for volume vol_dis_rep 

Version-Release number of selected component (if applicable):
============================================================
glusterfs 3.4.0.52rhs built on Dec 19 2013 12:20:16

Cases to verify:
=================
1)For "start", "stop", "status", "commit" and "commit force" the volume should be in started state . 

2) For "start", "stop", "status", "commit" , "commit force" ,"force" check if the brick path is valid for the volume before performing the any operation. 

Volume Name: vol_dis_rep
Type: Distributed-Replicate
Volume ID: 0b28d085-9715-4d79-ba7b-b830faa9f3f6
Status: Started
Number of Bricks: 4 x 2 = 8
Transport-type: tcp
Bricks:
Brick1: rhs-client11:/rhs/bricks/b1
Brick2: rhs-client12:/rhs/bricks/b1-rep1
Brick3: rhs-client11:/rhs/bricks/b2
Brick4: rhs-client12:/rhs/bricks/b2-rep1
Brick5: rhs-client11:/rhs/bricks/b3
Brick6: rhs-client12:/rhs/bricks/b3-rep1
Brick7: rhs-client11:/rhs/bricks/b4
Brick8: rhs-client12:/rhs/bricks/b4-rep1


root@rhs-client11 [Dec-26-2013- 6:57:48] >gluster v remove-brick vol_dis_rep rhs-client11:/rhs/bricks/b5 rhs-client12:/rhs/bricks/b5-rep1 stop
                                    Node Rebalanced-files          size       scanned      failures       skipped               status   run time in secs
                               ---------      -----------   -----------   -----------   -----------   -----------         ------------     --------------
'remove-brick' process may be in the middle of a file migration.
The process will be fully stopped once the migration of the file is complete.
Please check remove-brick process for completion before doing any further brick related tasks on the volume.

The brick path is not valid , But still the proper error message is not reported. 

3) "stop" , "status", "commit" and "commit force" the remove-brick process should be started on the valid bricks of the volume. 

4) For reducing the replica count of the volume using remove-brick one should use remove-brick command with "force" option or remove-brick without any options.