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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">Agreed – To add to Brian’s message, the only benefit to having this powered down standby IMO would be minimizing time to restore should the Publisher ever need
to be rebuilt in a DR situation. If you had a VM sharing the same IP address/hostname/cert information as the existing Publisher and running the same release (obviously not part of the production cluster and shut down), then your rebuild process skips the
installation tasks and goes straight to restoring from DRS backup or a subscriber’s DB.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">Have I seen customers do this? No… but in theory it can cut the rebuild time since the installation is already completed. Would I recommend this to a customer?
Probably not as well. What if you patch the production cluster to an ES or SU and forget to update the standby? What if someone powers up that VM and now you have a duplicate address and hostname on the network? Even with the time it saves, that’s only about
an hour or two at max and, as Brian said, you shouldn’t be relying on the Publisher for anything besides DB replication anyway. Seems more of an administrative burden than anything else IMO.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">Hope that helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040">Dan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#404040"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> cisco-voip [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>Brian Meade<br>
<b>Sent:</b> Friday, March 20, 2015 10:16 AM<br>
<b>To:</b> Ahmed Abd EL-Rahman<br>
<b>Cc:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> Re: [cisco-voip] CUCM Cluster Redundancy<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Ahmed,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I don't think this is a good route to go. Really you should have no dependence on the publisher besides configuration updates so it shouldn't be anything that affects operation.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would be concerned that the subscribers would have a more updated version of the database than the cold-standby publisher.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Brian<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Mar 20, 2015 at 10:03 AM, Ahmed Abd EL-Rahman <<a href="mailto:Ahmed.Rahman@bmbgroup.com" target="_blank">Ahmed.Rahman@bmbgroup.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Hi All,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> I have a UC cluster
</span><span style="font-size:9.0pt;font-family:"Tahoma",sans-serif">V10.5</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> on 2 UCS Blade servers having 1 Pub and 4 Subs, and I’d like to ask if there is any need or benefit
from having a cold standby virtual machine for the Pub server (a replicated VM for the Pub which is turned off to backup Pub functionality in case of Pub failure), and also if the license will be valid on this cold standby VM for the Pub so that if the main
Pub fails and we turned on the cold standby Pub VM everything will be fine and the operation continues normally.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Waiting your feedback.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#383E4C">Best Regards</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:1.0pt"><span style="font-family:"Verdana Bold";color:#383E4C">Ahmed Abd EL-Rahman</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:1.0pt"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#383E4C">Senior Network Engineer</span><o:p></o:p></p>
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