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    <p>You are correct, you are paying for uptime hours, not compute hours.</p> <p>One thing to be wary of is that you pay for partial hours without any proration, so if you rapidly scale up and down, you are eating full hours.</p> <p>As other people have mentioned, you can programatically scale up and down from within your application. however, in general a particular role will only have access to its own metrics (unless you save the metrics into storage), plus any global resource metrics (queue length, etc) so doing scaling based on CPU utilization etc may be difficult.</p> <p>Scaling up begins almost instantly with a machine taking a few minutes to spin up. There are no SLAs with spin-up offered currently. Microsoft has said that instances will come up at different times, so if you do a very large scale-up operation, it may be significant time before all instances are available; but some instances will be available almost immediately. You are not charged for an instance until it is fully spun-up.</p> <p>Scaling down happens almost immediately, but you cannot control which instances are used for the scale-down, so if 50% of your instances are idle and you do a 50% scale-down, you may kill off all of your active instances, and that work would need to be restarted on the previously idle instances. You must make sure your design supports good restarting of work (if you use queue timeouts, this can happen mostly automatically)</p> <p>There are a few 3rd party solutions starting to appear that aim to help out in scaling. One that I have looked at that looks promising is AzureWatch from <a href="http://paraleap.com/" rel="nofollow">http://paraleap.com/</a> which offers some things like automatic up/down scaling of web and worker roles based on utilization, queuelength, schedule etc.</p>
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    1. POAzure platform: scalling instances up and down
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    1. USJason Coyne
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