Bug 1089531

Description of problem:
-------------------------

As per the design doc [ https://forge.gluster.org/snapshot/pages/Home ]

"If any of the brick is down while taking snapshot then snapshot creation will fail. If force option is provided and quorum at server is met then snapshot creation will succeed if any bricks are down.."

But able to create Snap of Distributed volume when one brick was down.




Version-Release number of selected component (if applicable):
-------------------------------------------------------------
3.5qa2-0.340.gitc193996.el6_5.x86_64

How reproducible:
always

Steps to Reproduce:
1. created distributed volume having four brick. Start that volume and mount it
2. bring one brick down by killing brick process
3. take snap of that volume and its successful.

[root@OVM3 ~]# gluster v status dht1
Status of volume: dht1
Gluster process						Port	Online	Pid
------------------------------------------------------------------------------
Brick 10.70.35.13:/brick1				49152	Y	18048
Brick 10.70.35.54:/brick1				49152	Y	17629
Brick 10.70.35.71:/brick1				49152	Y	18199
Brick 10.70.35.159:/brick1				49152	Y	17610
NFS Server on localhost					2049	Y	18306
NFS Server on 10.70.35.159				2049	Y	18256
NFS Server on 10.70.35.71				2049	Y	18212
NFS Server on 10.70.35.54				2049	Y	18258
 
Task Status of Volume dht1
------------------------------------------------------------------------------
There are no active volume tasks
 
[root@OVM3 ~]# kill -9 18048
[root@OVM3 ~]# gluster v status dht1
Status of volume: dht1
Gluster process						Port	Online	Pid
------------------------------------------------------------------------------
Brick 10.70.35.13:/brick1				N/A	N	18048
Brick 10.70.35.54:/brick1				49152	Y	17629
Brick 10.70.35.71:/brick1				49152	Y	18199
Brick 10.70.35.159:/brick1				49152	Y	17610
NFS Server on localhost					2049	Y	18306
NFS Server on 10.70.35.159				2049	Y	18256
NFS Server on 10.70.35.54				2049	Y	18258
NFS Server on 10.70.35.71				2049	Y	18212
 
Task Status of Volume dht1
------------------------------------------------------------------------------
There are no active volume tasks
 
[root@OVM3 ~]# gluster snapshot create snap1 dht1
snapshot create: snap1: snap created successfully


Actual results:
Able to create Snap event hough brick is down


Expected results:
As per design doc, Snap creation should fail in case of brick down (for Distributed Volume)

Additional info: