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

[Mike Armstrong]

I'm sure this is not the advice you want, but we recently converted 
3.3(3)->4.0(2a)->4.1(2) in one swell foop with minor issues only (See Digest 
22/78).  We only have 226 phones, but I think one thing the CCM does do well 
is scale.  Until we're able to build a satisfactory 
testing/staging/converting platform, our upgrade strategy will be to just do 
a normal upgrade of the production environment.  One risk might be that a 
phone s/w upgrade might have to be rolled back, which might require some 
contingency planning if that couldn't be done for some reason (e.g., 
signed->unsigned loads).

mike


> Date: Mon, 24 Jan 2005 09:57:30 -0000
> From: "chris donnelly" <c.donnelly at skynetsystems.co.uk>
> Subject: [cisco-voip] Advice on CCM3 to CCM4 Migration please
> To: <cisco-voip at puck.nether.net>
> Message-ID:
> <D85DD04BAE5142459B072A3B53F74822CC77FF at skymail.skynetsystems.co.uk>
> Content-Type: text/plain; charset="us-ascii"
>
> 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