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Our physical infrastructure is Linux hosted on 3Tera's AppLogic.
Our long term plan is to host the application within our firewall using Linux on VMWare.
Here is my best guess on the time line for this transition.

Migration To VMWare

November 1 - 12 2010
Move from 3Tera to Carinet and terminate contract with 3Tera/CA Technologies.
This amounts to a change in service providers.
We will still be using Linux on AppLogic.

November 15 - December 15 2010
Migrate virtual infrastructure from AppLogic to VMWare.
Here we are essentially building three unique virtual linux machines in VMWare.
See the architecture diagram below for a bit more detail on these three machines.
We will still be hosted by Carinet.
We expect to go into production while we are on Carinet.

March 31 2011
Migrate to City's virtual infrastructure.
Here we will copy the virtual machines from Carinet to the city's infrastructure.
There will be some additional work to do in the context of the production environment.

Application Deployment

As you can see from this diagram the deployment is straight-forward.

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