<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" >Thank you all for your responses.<br><br>I guess the decision should be based on the 3rd host's connectivity to the rest of the cluster. If the 3rd host can only communicate over a single network then I might as well use the QDevice, otherwise a full blown node would be preferable to take full advantage of multiple networks.<br><br>The note about SBD fencing is also appreciated, will need to test it out.<br><br>Thanks again!<br> </div>
<div dir="ltr" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" ><div style="font-size: 12pt; font-weight: bold; font-family: sans-serif; color: #7C7C5F;" ><span style="font-size:10pt;" ><span style="font-family:Arial,Helvetica,sans-serif;" ><span style="color:#000000;" >Gerry Sommerville</span></span></span></div>
<div style="font-size: 8pt; font-family: sans-serif; margin-top: 10px;" ><div><span style="font-weight: bold; color: #336699;" >E-mail: </span><a href="mailto:gerry@ca.ibm.com" style="color: #555" target="_blank">gerry@ca.ibm.com</a></div></div></div></div></div></div>
<div dir="ltr" > </div>
<div dir="ltr" > </div>
<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: "Klaus Wenninger" <kwenning@redhat.com><br>Sent by: "Users" <users-bounces@clusterlabs.org><br>To: "Strahil Nikolov" <hunter86_bg@yahoo.com>, "Cluster Labs - All topics related to open-source clustering welcomed" <users@clusterlabs.org><br>Cc:<br>Subject: [EXTERNAL] Re: [ClusterLabs] QDevice vs 3rd host for majority node quorum<br>Date: Wed, Jul 14, 2021 4:20 AM<br> <br><!-- BaNnErBlUrFlE-HeAdEr-start --> <!-- BaNnErBlUrFlE-HeAdEr-end --> <!-- BaNnErBlUrFlE-BoDy-start --> <!-- Preheader Text : BEGIN --> <span style="display:none !important;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;" > On Tue, Jul 13, 2021 at 9:56 PM Strahil Nikolov <hunter86_bg@yahoo.com> wrote: In some cases the third location has a single IP and it makes sense to use it as QDevice. If it has multiple network connections to that location - use a full </span> <!-- Preheader Text : END --> <!-- Email Banner : BEGIN --> <span style="display:none !important;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;" >ZjQcmQRYFpfptBannerStart</span> <!--[if ((ie)|(mso))]>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="padding: 3px 0px 16px 0px;" ><tr><td>
<table class="pfptBannerTableMSO" border="0" cellspacing="0" cellpadding="0" style="padding: 0px 10px 5px 6px; width: 100%;border-radius:4px;border-top:4px solid #90a4ae;background-color:#d0d8dc;" ><tr><td valign="top" >
<table align="left" border="0" cellspacing="0" cellpadding="0" style="padding: 4px 8px 4px 8px" >
<tr><td><span class="pfptTitleMSO" style="color:#000000 !important;font-family: 'Arial', sans-serif;font-weight:bold !important;font-size:14px !important;" >
This Message Is From an External Sender
</span></td></tr>
<tr><td><span class="pfptSubtitleMSO" style="color:#000000 !important;font-weight:normal !important;font-family: 'Arial', sans-serif; font-size:12px !important;" >
This message came from outside your organization.
</span></td></tr>
</table>
</td></tr></table>
</td></tr></table>
<![endif]--> <!--[if !((ie)|(mso))]-->
<div style="margin:16px 0px 16px 0px; padding:8px 16px 8px 16px; border-radius: 4px; min-width: 200px;background-color: #d0d8dc; border-top: 4px solid #90a4ae;" ><div style="display: inline-block; margin: 0px 0px 1px 0px; max-width: 600px;" ><div style="color:#000000 !important;font-family: 'Arial', sans-serif !important;font-weight:bold !important;font-size:14px !important;line-height:18px;display:block;" >This Message Is From an External Sender</div>
<div style="color:#000000 !important;font-weight:normal !important;font-family: 'Arial', sans-serif !important;font-size:12px !important;line-height:18px;margin-top:2px;display:block" >This message came from outside your organization.</div></div></div><!--[endif]--> <span style="display:none !important;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;" >ZjQcmQRYFpfptBannerEnd</span><br><!-- Email Banner : END --> <!-- BaNnErBlUrFlE-BoDy-end -->
<div dir="ltr" ><div dir="ltr" > </div>
<div><div dir="ltr" >On Tue, Jul 13, 2021 at 9:56 PM Strahil Nikolov <<a href="mailto:hunter86_bg@yahoo.com" target="_blank">hunter86_bg@yahoo.com</a>> wrote:</div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" >In some cases the third location has a single IP and it makes sense to use it as QDevice. If it has multiple network connections to that location - use a full blown node .</blockquote>
<div>If you are intending to use watchdog-fencing via sbd with a short watchdog-timeout</div>
<div>that might speak for a full blown node as well. When using QDevice quorum-state</div>
<div>update may occur with a different delay (up to roughly 30s using the default) which</div>
<div>requires watchdog-timeout to be long enough for the nodes to survive till that is</div>
<div>settled and stonith-watchdog-timeout to be even longer to prevent split-brain. </div>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" ><div id="gmail-m_5746328911620171787yMail_cursorElementTracker_1626206117951" > </div>
<div id="gmail-m_5746328911620171787yMail_cursorElementTracker_1626206118188" >Best Regards,</div>
<div id="gmail-m_5746328911620171787yMail_cursorElementTracker_1626206122048" >Strahil Nikolov<br>
<blockquote style="margin:0px 0px 20px" ><div style="font-family:Roboto,sans-serif;color:rgb(109,0,246)" ><div>On Tue, Jul 13, 2021 at 20:44, Andrei Borzenkov</div>
<div><<a href="mailto:arvidjaar@gmail.com" target="_blank">arvidjaar@gmail.com</a>> wrote:</div></div>
<div style="padding:10px 0px 0px 20px;margin:10px 0px 0px;border-left:1px solid rgb(109,0,246)" >On 13.07.2021 19:52, Gerry R Sommerville wrote:<br clear="none" >> Hello everyone,<br clear="none" >> I am currently comparing using QDevice vs adding a 3rd host to my<br clear="none" >> even-number-node cluster and I am wondering about the details concerning network<br clear="none" >> communication.<br clear="none" >> For example, say my cluster is utilizing multiple heartbeat rings. Would the<br clear="none" >> QDevice take into account and use the IPs specified in the different rings? Or<br clear="none" ><br clear="none" >No.<br clear="none" ><br clear="none" >> does it only use the one specified under the quorum directive for QDevice?<br clear="none" ><br clear="none" >Yes. Remote device is unrelated to corosync rings. Qdevice receives<br clear="none" >information of current cluster membership from all nodes (point of<br clear="none" >view), computes partitions and selects partition that will remain quorate.
<div id="gmail-m_5746328911620171787yqtfd51932" ><br clear="none" >_______________________________________________<br clear="none" >Manage your subscription:<br clear="none" ><a href="https://lists.clusterlabs.org/mailman/listinfo/users" shape="rect" target="_blank">https://lists.clusterlabs.org/mailman/listinfo/users</a><br clear="none" ><br clear="none" >ClusterLabs home: <a href="https://www.clusterlabs.org/" shape="rect" target="_blank">https://www.clusterlabs.org/</a></div></div></blockquote></div>_______________________________________________<br>Manage your subscription:<br><a href="https://lists.clusterlabs.org/mailman/listinfo/users" rel="noreferrer" target="_blank">https://lists.clusterlabs.org/mailman/listinfo/users</a><br><br>ClusterLabs home: <a href="https://www.clusterlabs.org/" rel="noreferrer" target="_blank">https://www.clusterlabs.org/</a></blockquote></div></div>
<div><font size="2" face="Default Monospace,Courier New,Courier,monospace" >_______________________________________________<br>Manage your subscription:<br><a href="https://lists.clusterlabs.org/mailman/listinfo/users" target="_blank">https://lists.clusterlabs.org/mailman/listinfo/users</a> <br><br>ClusterLabs home: <a href="https://www.clusterlabs.org/" target="_blank">https://www.clusterlabs.org/</a> </font></div></blockquote>
<div dir="ltr" > </div></div></div><BR>
<BR>