title: Does every server in a MongoDB replica set need to have exactly the same RAM?
body: <p>Can I set up a replica set in MongoDB 1.8 using servers with different amounts of RAM?</p>
  
  <ul>
  <li>server1: 5gb</li>
  <li>server2: 2gb</li>
  <li>server3: 4gb</li>
  </ul>
  
  <p>If yes, what are the pros and cons?</p>