title: Can't map file memory-mongo requires 64 bit build for larger datasets
body: <p>I have a sharded cluster in 3 systems.
  While inserting I get the error message:</p>
  
  <pre><code>cant map file memory-mongo requires 64 bit build for larger datasets
  </code></pre>
  
  <p>I know that 32 bit machine have a limit size of 2 gb.
  I have two questions to ask.</p>
  
  <ol>
  <li>The 2 gb limit is for 1 system, so the total data will be, 6gb as my sharding is done in 3 systems. So it would be only 2 gb or 6 gb?</li>
  <li>While sharding is done properly, all the data are stored in single system in spite of distributing data in all the three sharded system?</li>
  </ol>
  
  <p>Does Sharding play any role in increasing the datasize limit?
  Does chunk size play any vital role in performance?</p>