Converting SUB to PUB?

Answered Question
Mar 29th, 2010

Is it possible? or is it still on one of the Cisco's "feature request" lists?

Any clarification from Cisco would be greatly appreciated.

I have this problem too.
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Correct Answer by David Hailey about 6 years 8 months ago

This is unfortunately a thread from 2002 which was likely a 3x or 4x install where the application and OS were separate. Today they are heavily entangled within each other. To reinstall the CUCM software, you would need to install from DVD which reformats the hard drives and etc. Even if this was successful back in the day, I doubt it was a supported solution...but that's neither here nor there.

Hailey

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Correct Answer by htluo about 6 years 8 months ago

It's been talking for a while.  We were expecting it on CUCM 8.0.  But unfortunately it didn't make it.

Someone said it would be in 9.x.  But it's not "concept commit" yet, which means it could be dropped again.

Michael

Correct Answer by Aaron Harrison about 6 years 8 months ago

Do you have any proof to the contrary?

Feel free to try it...

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ktran-anet Wed, 03/31/2010 - 11:02

Thanks David and I do appreciate your response. However, do you happen to have any evidence to support your statement?

Correct Answer
David Hailey Wed, 03/31/2010 - 11:35

This is unfortunately a thread from 2002 which was likely a 3x or 4x install where the application and OS were separate. Today they are heavily entangled within each other. To reinstall the CUCM software, you would need to install from DVD which reformats the hard drives and etc. Even if this was successful back in the day, I doubt it was a supported solution...but that's neither here nor there.

Hailey

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David Hailey Wed, 03/31/2010 - 11:29

I would offer the pages and pages of SRND's for the various versions of CUCM and the design and installation guides that go along with them for you to read.  This is a basic tenant of the CUCM architecture.  Once a Publisher is installed, it is the primary node in the cluster for DB operations and other sub-system processes.  You could easily put in a TAC case and ask the same question of Cisco and quickly get an official response that matches what you got here.  There is no way to inherently flip the basic role a server provides within the cluster after it is built.  You can completely rebuild a server from scratch and designate it to be a Publisher.  If you consider that "converting a Sub to a Pub" then OK; however, the nature of your question is usually quite the contrary as folks are looking to quickly recover from a Publisher failure by designating another node in the cluster as the Publisher and it just doesn't work that way.  There are a LOT of really talented engineers on the forums including myself, William Bell, Aaron Harrison, Rob Huffman, HT Luo, TCat...the list goes on (I can't begin to name them all).  They can all vouch for my answer and the evidence is years and years of combined experience working with all facets of IP telephony and Unified Communications products.

In closing, I understand your question and why you might ask it - no issues there.  Will this be something you see in the future?  Maybe.  There's been a  lot of talk of having a backup Publisher model for years but it's never  happened.  So, in the meantime - things are what they are.

Hailey

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Correct Answer
htluo Wed, 03/31/2010 - 11:23

It's been talking for a while.  We were expecting it on CUCM 8.0.  But unfortunately it didn't make it.

Someone said it would be in 9.x.  But it's not "concept commit" yet, which means it could be dropped again.

Michael

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