<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><br class=""></div><div class="">Dear Ashish,</div><div class=""><br class=""></div><div class="">thank you very much for the information and for the provided examples. They really help.</div><div class=""><br class=""></div><div class="">I think that it may be useful to stick a label on each server in order to identify the group they belong to.</div><div class="">For example:</div><div class=""><br class=""></div><div class="">server n.01 (label: Group 01)</div><div class="">server n.02 (label: Group 01)</div><div class="">server n.03 (label: Group 01)</div><div class=""><br class=""></div><div class="">server n.04 (label: Group 02)</div><div class="">server n.05 (label: Group 02)</div><div class="">server n.06 (label: Group 02)</div><div class=""><br class=""></div><div class="">So, if server n.01 and server n.06 go down I know that there will be no problem for the data.</div><div class="">But, if server n.05 and n.06 go down, I can start to cry.</div><div class=""><br class=""></div><div class="">Thank you again,</div><div class="">Mauro Tridici</div><br class=""><div><blockquote type="cite" class=""><div class="">Il giorno 20 set 2017, alle ore 09:33, Ashish Pandey <<a href="mailto:aspandey@redhat.com" class="">aspandey@redhat.com</a>> ha scritto:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt;" class=""><div class=""><br class=""></div><div class="">After adding 3 more nodes you will have 6 nodes and 2 HD on each nodes. </div><div class="">It depends on the way you are going to add new bricks on the existing volume 'vol"<br class=""></div><div class="">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 class=""></div><div class="">When you make 6 * (4+2) to 12 * (4+2) you have to provide path of the bricks you want to add.<br class=""></div><div class=""><br class=""></div><div class="">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 class=""></div><div class="">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 class=""></div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Ashish<br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><hr id="zwchr" class=""><div style="font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;" class=""><b class="">From: </b>"Mauro Tridici" <<a href="mailto:mauro.tridici@cmcc.it" class="">mauro.tridici@cmcc.it</a>><br class=""><b class="">To: </b><a href="mailto:gluster-users@gluster.org" class="">gluster-users@gluster.org</a><br class=""><b class="">Sent: </b>Tuesday, September 19, 2017 1:09:06 AM<br class=""><b class="">Subject: </b>[Gluster-users] how many hosts could be down in a 12x(4+2) distributed dispersed volume?<br class=""><div class=""><br class=""></div>Dear All,<br class=""><div class=""><br class=""></div>I just implemented a (6x(4+2)) DISTRIBUTED DISPERSED gluster (v.3.10) volume based on the following hardware:<br class=""><div class=""><br class=""></div>- 3 gluster servers (each server with 2 CPU 10 cores, 64GB RAM, 12 hard disk SAS 12Gb/s, 10GbE storage network)<br class=""><div class=""><br class=""></div>Now, we need to add 3 new servers with the same hardware configuration respecting the current volume topology.<br class=""><br class=""><div class=""><br class=""></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 class=""><div class=""><br class=""></div>Thank you very much.<br class="">Mauro Tridici<br class=""><div class=""><br class=""></div>_______________________________________________<br class="">Gluster-users mailing list<br class="">Gluster-users@gluster.org<br class="">http://lists.gluster.org/mailman/listinfo/gluster-users<br class=""></div><div class=""><br class=""></div></div></div></div></blockquote></div><br class=""><div class="">
<span class="Apple-style-span" style="border-collapse: separate; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: normal; border-spacing: 0px;"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class=""><br class="Apple-interchange-newline">-------------------------</div><div class="">Mauro Tridici</div><div class=""><br class=""></div><div class="">Fondazione CMCC</div><div class="">CMCC Supercomputing Center</div><div class="">presso Complesso Ecotekne - Università del Salento -</div><div class="">Strada Prov.le Lecce - Monteroni sn</div><div class="">73100 Lecce IT</div><div class=""><a href="http://www.cmcc.it" class="">http://www.cmcc.it</a></div><div class=""><br class=""></div><div class="">mobile: (+39) 327 5630841</div><div class="">email: <a href="mailto:mauro.tridici@cmcc.it" class="">mauro.tridici@cmcc.it</a></div></span></span>
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