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6.9. Creating Distributed Dispersed Volumes

Distributed dispersed volumes support the same configurations of erasure coding as dispersed volumes. The number of bricks in a distributed dispersed volume must be a multiple of (K+M). With this release, the following configurations are supported:
  • Multiple disperse sets containing 6 bricks with redundancy level 2
  • Multiple disperse sets containing 11 bricks with redundancy level 3
  • Multiple disperse sets containing 12 bricks with redundancy level 4
Use gluster volume create to create different types of volumes, and gluster volume info to verify successful volume creation.
Prerequisites
Illustration of a Distributed Dispersed Volume
View larger image
Illustration of a Distributed Dispersed Volume

Figure 6.8. Illustration of a Distributed Dispersed Volume

Creating distributed dispersed volumes

Important

Red Hat recommends you to review the Distributed Dispersed Volume configuration recommendations explained in Chapter 28, Recommended Configurations - Dispersed Volume before creating the Distributed Dispersed volume.
  1. Run the gluster volume create command to create the dispersed volume.
    The syntax is # gluster volume create NEW-VOLNAME disperse-data COUNT [redundancy COUNT] [transport tcp | rdma | tcp,rdma] NEW-BRICK...
    The default value for transport is tcp. Other options can be passed such as auth.allow or auth.reject. See Section 10.1, “Configuring Volume Options” for a full list of parameters.

    Example 6.9. Distributed Dispersed Volume with Six Storage Servers

    # gluster volume create test-volume disperse-data 4 redundancy 2 transport tcp server1:/exp1/brick1 server2:/exp2/brick2 server3:/exp3/brick3 server4:/exp4/brick4 server5:/exp5/brick5 server6:/exp6/brick6 server1:/exp7/brick7 server2:/exp8/brick8 server3:/exp9/brick9 server4:/exp10/brick10 server5:/exp11/brick11 server6:/exp12/brick12
Creation of test-volume has been successful
Please start the volume to access data.
    Copy to Clipboard Toggle word wrap
    The above example is illustrated in the figure Illustration of a Distributed Dispersed Volume. In the illustration and example, you are creating 12 bricks from 6 servers.
  2. Run # gluster volume start VOLNAME to start the volume. 
    # gluster volume start test-volume
Starting test-volume has been successful
    Copy to Clipboard Toggle word wrap
  3. Run gluster volume info command to optionally display the volume information.
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