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What is Auto-Scaling?

By Heather Robinette

Auto-scaling (or Autoscale) is the process of allocating resources to match performance requirements and help minimize costs. Typically, this is an automated process that is set by policies or rules so you don’t have to continually monitor the performance and it can manage itself. As users demand more resources, the system is able to maintain the desired level based on the policies and as demand decreases, it can de-allocate those resources to help reduce costs.

Ways to Scale

Vertical Scaling: This type of scaling refers to changing the capacity of a resource and is not done as often. Vertical scaling also may require the system to be temporarily unavailable while it is being redeployed.

Horizontal Scaling: This type of scaling refers to adding or removing instances of a resources and is the more common of the two. Additional resources can be provisioned without interruption of current resources and they can be easily shut down without impacting other resources

While autoscale in Microsoft Azure can be a huge benefit, ensuring you take the time to create a strategy and implement it properly, will provide you the best results. Some things to keep in mind as you are planning out your strategy are that you will need to know what criteria you want to use, aggregation type, threshold, and what will trigger the rule.

Here is a breakdown of each category:

Criteria Metrics
Percentage CPU
Network In
Network Out
Disk Read Bytes
Disk Write Bytes
Disk Read Operations/Sec
Disk Write Operations/Sec
CPU Credits Remaining
CPU Credits Consumed

Aggregation Type
Average
Minimum
Maximum
Total
Last
Count

Threshold Operator
Greater than
Greater than or equal to
Less than
Less than or equal to
Equal to
Not equal to

Triggers
Increase count by
Increase percent by
Increase count to
Decrease count to
Decrease percent by
Decrease count by

Check out some best practices for auto-scaling with MyCloudIT to see how we’ve helped simplify the process.

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Tags: Cost Optimization

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