[Gluster-users] Problem adding brick to an existing volume

[Atin Mukherjee]

On 04/28/2015 04:41 PM, Oliver wrote:
> Hi Gluster Users,
> 
> I am hoping that someone can help me put me on the right track maybe ..
> 
> Objective is to have a high available, extensible storage cluster with a
> fair rate of redundancy.
> 
> I was thinking of a cluster of multiple machines, starting with 2
> servers, 2 disks each and a config of
> 
> Volume Name: originals
> Type: Distributed-Replicate
> Volume ID: xx
> Status: Started
> Number of Bricks: 2 x 2 = 4
> Transport-type: tcp
> 
> Volume: originals
> Brick srv1:/srv/vol1 (/dev/sdb1 500GB)
> Brick srv1:/srv/vol2 (/dev/sdc1 500GB)
> Brick srv2:/srv/vol1 (/dev/sdb1 500GB)
> Brick srv2:/srv/vol2 (/dev/sdb1 500GB)
> 
> Now I would like to add another server with JUST 1 500GB disk, peer
> probe and everything is fine so far, but when it comes to adding the brick:
> 
> root at srvdst01:~# gluster volume add-brick videos srv3:/srv/vol1
> volume add-brick: failed: Incorrect number of bricks supplied 1 with
> count 2
> 
> Ok, trying to change the num of replica's or whatever just results in
> 
> root at srvdst01:~# gluster volume add-brick videos replica 3
> srv3:/srv/vol1 (or vol3 or vol4, this doesnt matter)
> volume add-brick: failed: Operation failed
> 
> No way to get around this .. What do I have to do ? Add two bricks in 1
> command ? How would it work in the future when I gets to production
> machines with each 2 or even more disks ?
Since the existing configuration is 2 X 2 and if you are willing to
continue to make this volume a distribute-replicate one, you should add
two bricks saying gluster v add-brick videos replica 2 <brick1> <brick2>

However, I think you could still convert it from replica 2 to replica 3
with the command what you attempted. Can you share the glusterd log file
of all the nodes to debug it further.

Adding Ravi in cc.

~Atin
> 
> Were great someone could gimme a hint.
> 
> Its gluster 3.4.2-1ubuntu1 amd64 on ubuntu 14.04 LTS.
> 
> regards, Oliver
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> 

-- 
~Atin