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Setting up a globally accessed redundant hosted infrastructure?

Im looking into the various ways people set up their hosted systems for a clients setup. This will essentially be the back end for an app which will interrogate an SQL backend. The app will be accessed from 200 countries with 5000 concurrent connections worldwide, it needs to be scalable and obviously redundant.  Its bigger than anything Iv ebeen involved in so looking for pointers on how any of you guys do it or would do it. Also companies which provide this time of thing for resellers etc. I obviously want to be involved and have ongoing profit from this as well.

Please fire away with ideas.
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Mlanda T
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The way to go for such apps these days is to use the Platform as a Service (PaaS) providers. This you will get with environments such a Microsoft Azure, Amazon Web Services. These offer you capacity provisioning, load balancing, auto-scaling (automatically increasing your server resources when numbers of users spike) to application health monitoring. They also offer availability across multiple geographical servers, automated backup and content management.
We have used a number of providers to do this same kind of thing.  In the end we settled on Azure as it had the best performance.  It is more than just having vm's or databases.  You need to also look at geo location load balancers and clusters.  

I would contact Microsoft, AWS, Rackspace, Google or any of their respective partners to really see what could be done for you.
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ASKER

Cheers guys, in terms of Azure Im actually setting up a test network on it just now. When I set up a VM say as a DC or an RDS server is this automatically redundant and load balanced etc or do I then set that up. Im only as far as building 2 servers ..
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Joshua Hopkins
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Cheers, for the input, looks like Azure is how Im going to pitch it. Now I need to get the other info I need before I speak to Azure rep's.