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Difference between memory, instance storage, and volume in AWS

I am new to AWS functionality and confused about these three things. For me, if I consider

  • Memory as RAM
  • Instance storage as hard disk space, what does size and volume mean?

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When you launch an instance on EC2, Amazon should look for a physical server that will host your instance with enough unallocated capacity to be able to run your instance.

In the case of the m1.medium instance, this physical host will need to have enough unallocated resources to fit the specifications of the m1.medium instance:

  • at least 1 unallocated core
  • 3.7 GiB
  • 1 410

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