Description of problem:

Replace-brick has not been started. Any operation done using replace-brick does not report that replace-brick has been started.

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 
Usage: volume replace-brick <VOLNAME> <BRICK> <NEW-BRICK> {start|pause|abort|status|commit [force]}

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 commit
replace-brick commit failed

root@Dagobah:~# gluster volume info backup
 
Volume Name: backup
Type: Distribute
Status: Started
Number of Bricks: 2
Transport-type: tcp
Bricks:
Brick1: dagobah:/tmp/brick
Brick2: dagobah:/tmp/brick1

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 abort
replace-brick abort failed

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 pause
replace-brick pause failed

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 commit force
incorrect source or destination brick
(This error message does not make sense as to why commit force has failed.)

root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 start
replace-brick started successfully


Only 
root@Dagobah:~# gluster volume replace-brick backup dagobah:/tmp/brick dagobah:/tmp/brick2 status
shows proper message saying that replace-brick is not started.