Debian 9 Stretch
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GlusterFS : Distributed + Replication Setting2017/06/21

Configure Storage Clustering.
For example, create a Distributed + Replication volume with 4 servers.
+----------------------+          |          +----------------------+
| [GlusterFS Server#1] | || [GlusterFS Server#2] |
|   +----------+----------+   |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
+----------------------+          |          +----------------------+
| [GlusterFS Server#3] | || [GlusterFS Server#4] |
|   +----------+----------+   |
|                      |                     |                      |
+----------------------+                     +----------------------+

It is recommended to use partitions for GlusterFS volumes which are different from the / partition. The environment on this example is set as that sdb1 is mounted on [/var/lib/glusterfs] directory for GlusterFS Configuration on all Nodes.
[2] Create a Directory for GlusterFS Volume on all Nodes.
mkdir -p /var/lib/glusterfs/dist-replica

[3] Configure Clustering like follows on a node. (it's OK on any node)
# probe the node

gluster peer probe node02

peer probe: success.
gluster peer probe node03

peer probe: success.
gluster peer probe node04

peer probe: success.
# show status

gluster peer status

Number of Peers: 3

Hostname: node02
Uuid: a39156f3-32cb-451e-9e34-08ce504d72bb
State: Peer in Cluster (Connected)

Hostname: node03
Uuid: b86b98e4-12b6-4581-984d-da420d7b3bbe
State: Peer in Cluster (Connected)

Hostname: node04
Uuid: 6a1fb91a-f483-48c7-8dc7-0f2ac4d8db94
State: Peer in Cluster (Connected)

# create volume

gluster volume create vol_dist-replica replica 2 transport tcp \
node01:/var/lib/glusterfs/dist-replica \
node02:/var/lib/glusterfs/dist-replica \
node03:/var/lib/glusterfs/dist-replica \

volume create: vol_dist-replica: success: please start the volume to access data
# start volume

gluster volume start vol_dist-replica

volume start: vol_dist-replica: success
# show volume info

gluster volume info

Volume Name: vol_dist-replica
Type: Distributed-Replicate
Volume ID: 539f9993-90c6-4b7a-88ab-43a860dfe165
Status: Started
Snapshot Count: 0
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Brick1: node01:/var/lib/glusterfs/dist-replica
Brick2: node02:/var/lib/glusterfs/dist-replica
Brick3: node03:/var/lib/glusterfs/dist-replica
Brick4: node04:/var/lib/glusterfs/dist-replica
Options Reconfigured:
transport.address-family: inet
performance.readdir-ahead: on
nfs.disable: on
[4] If use NFS mount from Clients, Start required services first and also configure like follwos.
gluster volume set vol_dist-replica nfs.disable off

volume set: success
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