Consider a roadway for automobile travel. If the roadway was unable to support the desired volume of traffic, we could improve matters in a number of possible ways. One improvement would be to upgrade the road materials (“the hardware”) from a dirt road to pavement to support higher travel speeds. This is vertically scaling up; the cars and trucks (“the software”) will be able to go faster. Alternatively, we could widen the road to multiple lanes. This is horizontally scaling out; more cars and trucks can drive in parallel. And of course we could both upgrade the road materials and add more lanes, combining scaling up with scaling out.
Scaling Azure Webapps
Scaling Azure apps
What is scalability?
Computer applications have well defined capacity limits. A system might properly handle a few
thousand user requests, but when numbers go way up to tens or hundreds of thousands, it may
not behave correctly – or not work at all.
Scalability = Ability to manage increased workload properly, given certain capacity limits.
Vertical / Scale up
Increase overall application capacity by adding resources to existing nodes.
Horizontal / Scale out
Increase overall application capacity by adding nodes.
Side to side
• Simple App Design
• No Load Balance required
• Single Point of Failure remains
• No latency improvements
• Complex Disaster Recovery strategy
• Can be closer to the end user
• Easier Disaster Recovery Strategies
• Possibly need of a Load Balance strategy
• Possible unlimited
• App must be multi-instance safe
• Can be automatic