title: Unable to change RDS instance class
body: <p>I'm trying to upgrade the instance class of our database to increase capacity, but whenever I try I get an error</p>
  <pre><code>An error occurred (InvalidParameterCombination) when calling the ModifyDBInstance operation: Invalid max storage size for engine name mysql and storage type gp2: 1001
  </code></pre>
  <p>I've tried using the RDS console, and the CLI but get the same error.</p>
  <p>I have absolutely no clue what this error means though. For storage, we have the following configuration:</p>
  <p><a href="https://i.stack.imgur.com/mvQVL.png" rel="noreferrer"><img src="https://i.stack.imgur.com/mvQVL.png" alt="storage config" /></a></p>
  <p>When I first setup the database, the storage was much smaller. We increased the storage to 1000GB to get more IOPs but everything was valid then. How can it be invalid now?</p>