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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=PT-BR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:windowtext'>Hello Adam,<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Thank you for replying me on this matter.<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>I was trying to use 8.4, but since it didn’t work, I tried with 9.0, but no sucess also.<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>I want only 1 copy of the data blocks for each server to backup server. I was figuring out this model, but I couldn’t apply it:<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Server 1: sdb1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Server 2: sdc1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Server 3: sdd1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Server 4: sde1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Server 5 (backup for the 4 servers) 4 disks: <o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Sdb1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Sdc1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Sdd1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Sde1 – 1TB<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>I was not able to configure as this, because I don’t the knowledge to do it. I got only 1 to 1, but I need 4 to 1.<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Thank you in advance,<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:windowtext'>Fernando<o:p></o:p></span></p><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='color:windowtext;mso-fareast-language:PT-BR'>De:</span></b><span style='color:windowtext;mso-fareast-language:PT-BR'> drbd-user-bounces@lists.linbit.com [mailto:drbd-user-bounces@lists.linbit.com] <b>Em nome de </b>Adam Goryachev<br><b>Enviada em:</b> domingo, 12 de novembro de 2017 20:34<br><b>Para:</b> drbd-user@lists.linbit.com<br><b>Assunto:</b> Re: [DRBD-user] Data Block Changes replication with 5 servers<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 09/11/17 05:01, <a href="mailto:fernandocmachado@yahoo.com.br">fernandocmachado@yahoo.com.br</a> wrote:<span style='mso-fareast-language:PT-BR'><o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>Hello everyone,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I’m trying to implemente the following scenario:<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>4 servers running KVM virtual machines and 1 server as a backup of the 4 servers.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>I’m trying to implemente the DRBD to replicate the data block changed from the 4 server to this backup server, but I don’t know how to do that, since all the “Howtos” on the internet applies only for 2 nodes replication.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Could anyone help me on this?<o:p></o:p></p></blockquote><p class=MsoNormal><span style='mso-fareast-language:PT-BR'>Yes.<br><br>I could add more, but then it probably wouldn't be helpful. On the other hand, you could add more information about your environment and it would definitely be helpful.<br>What version of DRBD are you using?<br>How many copies of the "data blocks" do you want? If it one copy on one of the 4 servers plus one copy on the "backup" server?<br>What is the storage capacity of the 4 servers and the backup?<br><br>OK, I'll add some hints...<br>If using DRBD 8.4:<br>For each of the four servers, configure DRBD together with the backup server. The backup server will need 4 x storage capacity of the other servers, you will end up with 2 copies of all data. Best to use LVM to create one LV for each remote server, and then use DRBD to connect these.<br><br>If using DRBD9:<br>Just setup DRBD as normal on all 5 nodes, and then use drbdmanage to ensure one copy is on the "backup" node and however many copies you need are on the other 4 nodes. Possibly, you want 5 copies of data, so all machines have a full copy of all data, but probably 5 copies of data is going to cause you a lot of problems.<br><br>In either case, keep in mind that the backup server is going to need enough ethernet bandwidth as well as disk IOPS to be able to write all data changes from all 4 nodes. This could massively reduce your overall disk IOPS. You should test carefully prior to deployment.<br><br>If you do provide more information, then me or someone else can likely provide more detailed/helpful advice.<br><br>Regards,<br>Adam <o:p></o:p></span></p><div><p class=MsoNormal><span style='mso-fareast-language:PT-BR'>-- <br>Adam Goryachev Website Managers <a href="http://www.websitemanagers.com.au">www.websitemanagers.com.au</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='mso-fareast-language:PT-BR'><br>-- The information in this e-mail is confidential and may be legally privileged. It is intended solely for the addressee. 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