[Gluster-users] Distributed-Replicated with mismatch number of bricks

[Amar Tumballi]

On Wed 12 Sep, 2018, 4:42 PM Jose V. Carrión, <jocarbur at gmail.com> wrote:

> Hi,
>
> I would like to implement  a distributed-replicated architecture but some
> of my nodes have different number of bricks. My idea is to do a replica 2
> through 6 nodes (all bricks with the same size).
>
> My gluster architecture is:
>
> Name node  |  Brick 1 | Brick 2
>
> ------------------------------------------
>
> Node1          |      R1     |             |
>
> Node2          |      R1     |             |
>
> Node3          |      R2     |     R3    |
>
> Node4          |      R2     |     R3    |
>
> Node5          |      R4      |     R5   |
>
> Node6          |      R4      |     R5   |
>
> My questions are:
>
> 1.  Would be this correct ?
>
> gluster volume create vol0 replica 2 transport tcp \
>     node1:/data/gluster/vol0/brick1 node2:/data/gluster/vol0/brick1 \
>     node3:/data/gluster/vol0/brick1 node4:/data/gluster/vol0/brick1 \
>     node3:/data/gluster/vol0/brick2 node4:/data/gluster/vol0/brick2 \
>     node5:/data/gluster/vol0/brick1 node6:/data/gluster/vol0/brick1 \
>     node5:/data/gluster/vol0/brick2 node6:/data/gluster/vol0/brick2 \
>
> Looks correct.

2 If I need to add a new node in the future, I will be able to extend my
> distributed replication system ? Something like:
>
> Name node  |  Brick 1 | Brick 2
>
> ------------------------------------------
>
> Node1          |      R1     |             |
>
> Node2          |      R2      |            |
>
> Node3          |      R3      |     R4   |
>
> Node4          |      R3      |     R4   |
>
> Node5          |      R5      |     R6   |
>
> Node6          |      R5      |     R6   |
>
> Node7          |      R1      |     R2   |
>
>
> gluster volume create vol0 replica 2 transport tcp \
>     node1:/data/gluster/vol0/brick1 node7:/data/gluster/vol0/brick1 \
>     node2:/data/gluster/vol0/brick1 node7:/data/gluster/vol0/brick2 \
>     node3:/data/gluster/vol0/brick1 node4:/data/gluster/vol0/brick1 \
>     node3:/data/gluster/vol0/brick2 node4:/data/gluster/vol0/brick2 \
>     node5:/data/gluster/vol0/brick1 node6:/data/gluster/vol0/brick1 \
>     node5:/data/gluster/vol0/brick2 node6:/data/gluster/vol0/brick2 \
>
>
This should be add-brick to  existing volume, and not another create volume

> 3. My nodes will also mount volumes (gluster clients) so in order to
> optimize the read performance operations,  what is the best replication
> system:  distributed-replicated or only replicated.
>
>
In this case, if you have just 3 machines, for read perf, replica is
better. If you have more nodes then to utilise all the storage you need
distributed replicate.

>
> Thanks in advance.
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