[cisco-voip] Advice on CCM3 to CCM4 Migration please

[chris donnelly]

Hi, 

Hopefully one of you guys have been through this and can recommend the
most painless way forward.... 

We have a customer who currently has an old 3.3.3 CCM Cluster with about
2000 phones hanging of it. 

They need to go to CCM 4.x and want to prove the environment / product
first by staging the new CCM 4 and then gradually moving users from the
old cluster to the new cluster. The downside of this is that it is not a
straightforward upgrade / replacement as the two clusters will live side
by side for a while. 

I have no problem with this apart from the sheer numbers involved. My
initial thought was to use the BAT tool to import all data from the
production cluster to the CCM4 cluster - but that still leaves me loads
of stuff to cross-pollinate i.e. Route patterns, partitions etc...etc...


My second thought is to build the CCM4 cluster from the Upgrade 'Replace
Server' option whilst building -but that forces me to use the old CCM3's
machine name etc so the two clusters cannot live side by side....unless
there is a way to build the CCM cluster by the 'Upgrade Replace Server'
option and then rename the machine name and change IP addresses etc... 

BTW I know everyone says that you cannot change machine names because of
SQL (but has anyone actually tried this?) - there are snippets of info
available on the web detailing how to change SQL machine names. 

Any advice gratefully received. 

Chris

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