[cisco-voip] CUCM Cluster Redundancy

[Daniel Pagan]

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.

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.

Hope that helps.

Dan

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Brian Meade
Sent: Friday, March 20, 2015 10:16 AM
To: Ahmed Abd EL-Rahman
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CUCM Cluster Redundancy

Ahmed,

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.

I would be concerned that the subscribers would have a more updated version of the database than the cold-standby publisher.

Brian

On Fri, Mar 20, 2015 at 10:03 AM, Ahmed Abd EL-Rahman <Ahmed.Rahman at bmbgroup.com<mailto:Ahmed.Rahman at bmbgroup.com>> wrote:
Hi All,
          I have a UC cluster V10.5 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.

Waiting your feedback.


Best Regards

Ahmed Abd EL-Rahman
Senior Network Engineer

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