Expanding Volume

Expanding Volumes

You can expand volumes, as needed, while the cluster is online and available. For example, you might want to add a brick to a distributed volume, thereby increasing the distribution and adding to the capacity of the GlusterFS volume.

Similarly, you might want to add a group of bricks to a distributed replicated volume, increasing the capacity of the GlusterFS volume.

Note

When expanding distributed replicated and distributed dispersed volumes, you need to add a number of bricks that is a multiple of the replica or disperse count. For example, to expand a distributed replicated volume with a replica count of 2, you need to add bricks in multiples of 2 (such as 4, 6, 8, etc.).

To expand a volume

If they are not already part of the TSP, probe the servers which contain the bricks you want to add to the volume using the following command:

# gluster peer probe <SERVERNAME>

For example:
```
# gluster peer probe server4
Probe successful
```
Add the brick using the following command:

# gluster volume add-brick <VOLNAME> <NEW-BRICK>

For example:
```
# gluster volume add-brick test-volume server4:/exp4
Add Brick successful
```

Check the volume information using the following command:

# gluster volume info <VOLNAME>

The command displays information similar to the following:

Volume Name: test-volume
Type: Distribute
Status: Started
Number of Bricks: 4
Bricks:
Brick1: server1:/exp1
Brick2: server2:/exp2
Brick3: server3:/exp3
Brick4: server4:/exp4

Rebalance the volume to ensure that files are distributed to the new brick.

You can use the rebalance command as described in Rebalancing Volumes