server migration to cloud via MS-azure

One of the organisations we do risk work for are migrating the bulk of their servers from an internally managed infrastructure to the cloud (via microsoft azure). They claim some of the servers cannot be migrated to the cloud, whereas the reasoning was pretty patchy, I wondered if you have perhaps a hybrid type setup, if there were any specific servers that werent really suitable candidates for migrating to the cloud, or for what reasons?

Also - when it comes to migrating a large portion of your server estate to azure, is there any specific logical order in which you migrate servers to azure, or does it not really matter?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You can have a Hybrid Cloud setup and this is completely normal, e.g. you may want to keep Active Directory in house, but deploy Messaging Solution in the cloud, because it's cheaper, to have to hosted in the Cloud, and then use Federated Active Directory between Cloud and your offices.

All Servers can be migrated to the cloud, it would depend on the workload of the server, versus cost of hosting in the Cloud.

You may want to migrate smaller workloads first as a test, but then some companies migrate messaging first, because of cost savings.
pma111Author Commented:
Can I just ask what benefits there would be in keeping AD in house? Why not migrate everything if its cheaper? i.e. you mention workload of a server vs cost of hosting in cloud, are you hinting that those with a larger workload could be cheaper to host on an internal infrastructure?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you lose access to the internet, nobody can login!

you hinting that those with a larger workload could be cheaper to host on an internal infrastructure?!

possibly, you need to do your calculations, but the big advantage is, that the Cloud can scale up very quickly,....

We have successfully used this procedure in this tutorial in the real world of IT, when one of our clients regularly has a “Sale Day in the autumn” – unfortunately their current infrastructure does not scale well to handle the thousands of concurrent transactions, and they do not want to spend any more money, on infrastructure, just for the sale day, that happens once a year. Customers would find the website used to crash when they opened the website for business at 10.00am, so we now “push” the website to the cloud, for this day for the  “Sale Day in the autumn”!
The customer is not impacted; and does not notice it has been migrated from an on-premise solution to the Cloud! (hosted on Windows Azure), and they are happy to "pay as you go" for their 24 hour hosted solution, whilst the sale is in progress. (and they no longer require our assistance, to do this).

see this Article

HOW TO: Migrate a VMware vSphere virtual machine to the Cloud (hosted on Windows Azure)

and we understand, why should they have to pay for huge infrastrcuture, which sits there 364 days doing nothing, only to have to use it 1 day a year!

Too Costly for them!

We actually have many clients that like the Pay As You Go approach to IT, that receive and Invoice every week/month, as to what IT is costing them!

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