<div dir="ltr">Hello!<br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 24, 2017 at 5:08 PM, FERNANDO FREDIANI <span dir="ltr"><<a target="_blank" href="mailto:fernando.frediani@upx.com">fernando.frediani@upx.com</a>></span> wrote:<br><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
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<p>Hi Denis, understood.<br>
What if in the case of adding a fourth host to the running
cluster, will the copy of data be kept only twice in any of the 4
servers ?</p></div></blockquote><div><br></div><div>replica volumes can be build only from 2 or 3 bricks. There is no way to make a replica volume from a 4 bricks. <br><br></div><div>But you may combine distributed volumes and replica volumes [1]:<br><br><pre><code class="gmail-hljs gmail-sql">gluster volume <span class="gmail-hljs-operator"><span class="gmail-hljs-keyword">create</span> test-volume replica <span class="gmail-hljs-number">2</span> transport tcp server1:/b1 server2:/b2 server3:/b3 server4:/b4</span></code></pre>test-volume would be like a RAID10 - you will have two replica volumes b1+b2 and b3+b4 combined into a single distributed volume. In that case you will<br>have only two copies of your data. Part of your data will be stored twice on b1 and b2 and another one part will be stored twice at b3 and b4<br>You will be able to extend that distributed volume by adding new replicas.<br><br></div><div><br>[1] <a href="https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Setting%20Up%20Volumes/#creating-distributed-replicated-volumes">https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Setting%20Up%20Volumes/#creating-distributed-replicated-volumes</a><br></div></div></div></div>