title: Does memcache use replica?
body: <p>I know memcache use consistency hashing to do shading.<br>
  <strong>But, do memcache do replication as disk storage?</strong>  </p>
  
  <p>I assume it will not. Since, losing one of the caching server just means the cache miss of that shard. It's not a single point of failure.  </p>
  
  <p>However, I still want to confirm.</p>