While AWS CloudWatch provides many useful storage statistics by default, such as the number of bytes written or read during a period of time, reads/writes per second, etc. a common metric customers want to know about is disk utilization. How much of EBS provisioned capacity is unused, resulting in wasted spending, is a question asked often.
As it’s very difficult to know how much storage an application will need over its lifetime, most people tend to over-provision their storage as an insurance policy. In the AWS cloud, however, you pay for what you provision, not for what you actually use. While we at FittedCloud solve this problem with our EBS Optimizer (which automatically and transparently provisions storage capacity for you) you may just want to simply know how much EBS space you are actually using. Having this knowledge at your fingertips is helpful for cloud cost monitoring and cloud cost optimization.
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