<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div><br></div><div>After adding 3 more nodes you will have 6 nodes and 2 HD on each nodes. </div><div>It depends on the way you are going to add new bricks on the existing volume 'vol"<br></div><div>I think you should remember that in a given EC sub volume of 4+2, at any point of time 2 bricks could be down.<br></div><div>When you make 6 * (4+2) to 12 * (4+2) you have to provide path of the bricks you want to add.<br></div><div><br></div><div>Suppose you want to add 6 bricks and all the 6 bricks are on 3 new nodes (2 each) then with respect to that sub volume you can tolerate 1 node going down. <br></div><div>If you are creating a 12 * (4+2) volume from the scratch and providing 12 bricks from each server then in that case even 2 nodes can go down without any issue.<br></div><div><br></div><div>I think You should focus more on the number of Hard Drive in a sub volume. You should ask yourself "How many bricks (HD) with in a sub volume will be unavailable if 1 or 2 nodes are going down?"</div><div><br></div><div>Ashish<br></div><div><br></div><div><br></div><div><br></div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Mauro Tridici" <mauro.tridici@cmcc.it><br><b>To: </b>gluster-users@gluster.org<br><b>Sent: </b>Tuesday, September 19, 2017 1:09:06 AM<br><b>Subject: </b>[Gluster-users] how many hosts could be down in a 12x(4+2) distributed dispersed volume?<br><div><br></div>Dear All,<br><div><br></div>I just implemented a (6x(4+2)) DISTRIBUTED DISPERSED gluster (v.3.10) volume based on the following hardware:<br><div><br></div>- 3 gluster servers (each server with 2 CPU 10 cores, 64GB RAM, 12 hard disk SAS 12Gb/s, 10GbE storage network)<br><div><br></div>Now, we need to add 3 new servers with the same hardware configuration respecting the current volume topology.<br><br><div><br></div>My question is: in the current volume configuration, only 2 bricks per subvolume or one host could be down without losing data. What it will happen in the next configuration? How many hosts could be down without losing data?<br><div><br></div>Thank you very much.<br>Mauro Tridici<br><div><br></div>_______________________________________________<br>Gluster-users mailing list<br>Gluster-users@gluster.org<br>http://lists.gluster.org/mailman/listinfo/gluster-users<br></div><div><br></div></div></body></html>