8.3. Expanding Volumes

Expanding a Volume

1. From any server in the trusted storage pool, use the following command to probe the server on which you want to add a new brick :

   # gluster peer probe HOSTNAME# gluster peer probe HOSTNAME

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   For example:

   # gluster peer probe server4
   Probe successful

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2. Add the brick using the following command:

   # gluster volume add-brick VOLNAME NEW_BRICK# gluster volume add-brick VOLNAME NEW_BRICK# gluster volume add-brick VOLNAME NEW_BRICK

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   For example:

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

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   If you want to change the replica/stripe count, you must add the replica/stripe count to the add-brick command.
   For example,

   # gluster volume add-brick replica 2 test-volume server4:/exp4

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   When increasing the replica/stripe count of a distribute replicate/stripe volume, the number of replica/stripe bricks to be added must be equal to the number of distribute subvolumes.
3. Check the volume information using the following command:

   # gluster volume info

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   The command output displays information similar to the following:

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

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4. Rebalance the volume to ensure that files are distributed to the new brick. Use the rebalance command as described in Section 8.7, “Rebalancing Volumes”.