Gluster users - Jul 2019 - change voulme type replica 3 to a distributed replicated volume

Good day everyone,
Currently we have a replica of 3 servers at the near future it will reach 
its maximum capacity and we are planning to add 1 server to increase the 
capacity by?changing the current volume type to distributed replicated.


can you give me some guide or instructions on how i can accomplish this.


Thanks.



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