AWS EC2 Terminology
- Virtual Server = Instances (Powered On or Off) - Amazon Machine Image (AMI) = Machine Disk Template to create machine in the cloud - Ephemeral (A-phem-ral) Storage = Instance Hard Disk (Temporary), when you power down the machine its gone (deleted). Mostly used for templates. - Elastic Block Store (EBS) = Instance Hard Disk saved. They are slower than the ephemeral storage. They stay around after you power off. EBS drives are replicated to another system. Ensure you have a backup. - Elastic Compute Unit (ECU) = Measure of EC2 Processor. More info below: Understanding Processing Power Ratings: - Everything in AWS is virtual, but they really are physical items. - To provide consistent performance, AWS created the EC2 compute unit (ECU). - 1.0 – 1.2 GHz 2007 Xeon processor, that’s the measure of speed. - Combine that with the number of cores Measuring Instance Types: Instance types always include a mix of memory, processing power, storage and I/O performance. Bes
