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4th server to CM group

Answered Question
May 6th, 2009
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Don't have more than 3 server in my cluster but I wonder what happen when you try to add 4th server to CM group.

Any error message pop up?

Correct Answer by Rob Huffman about 8 years 3 months ago

Hi Chris,


Very nice example of how to set up CCM Groups! +5 points my friend.


Cheers!

Rob


PS: Konrad, if you try to add a 4th CCM to a Group that already exists with 3 members, an error box will pop up preventing this action :)

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chadlincoln Wed, 05/06/2009 - 10:29
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There should be no problems. Just add the server to the Pub as a node before you install and have the security password ready. Also confirm that your licensing on the pub allows for that additional node.


Please rate if this helped.


Edit: I didn't read the entire problem. You can only have 3 servers in a CM group. I thought you were asking in a cluster.

Jaime Valencia Wed, 05/06/2009 - 10:44
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that is not correct:


A Cisco Unified Communications Manager Group specifies a prioritized list of up to three Cisco Unified Communications Managers.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/6_1_1/ccmcfg/b02cmgrp.html


I'm not sure if you receive a pop-up or if simply the add arrow greys out, but for sure you cannot add a 4th member


HTH


java


if this helps, please rate

Chris Deren Wed, 05/06/2009 - 13:18
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If you have more than 3 call processing servers you simply structure your groups to provide redundancy/load balances accordingly. I have one 10 node cluster with 8 call processing servers (8 is max) where I did 4 groups as following:

Group1:

Sub1, Sub2, Sub4

Group 2:

Sub3, Sub4, Sub2

Group3:

Sub5, Sub6, Sub8

Group4:

Sub7, Sub8, Sub6


This way you accomplish 1:1 redundancy where the even CMs are backups, and they are also secondary backups to other groups.


HTH,


Chris




KonradStepniewski Wed, 05/06/2009 - 23:03
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Could you try to add 4th server to new Group5? I wonder what happen.


Thanks for nice redundancy example.

Chris Deren Thu, 05/07/2009 - 05:35
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Not sure what you mean, I have 8 servers wich is the max distributed between 4 groups. You can create more groups if you want your deisgn to be different, but you can only have 3 CMs in a single group, CM will not let you add more.


HTH, Please rate all posts!


Chris

Correct Answer
Rob Huffman Thu, 05/07/2009 - 05:47
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Hi Chris,


Very nice example of how to set up CCM Groups! +5 points my friend.


Cheers!

Rob


PS: Konrad, if you try to add a 4th CCM to a Group that already exists with 3 members, an error box will pop up preventing this action :)

Chris Deren Thu, 05/07/2009 - 05:51
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It will prevent it, it will not let you save and and give you the following error message:


" Update failed. A Cisco CallManager Group may not contain more than 3 Cisco CallManagers"


HTH,


Chris

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