title: Mongodb Primary shard cluster down
body: <p>just wanted to understand a scenario where if primary shard cluster down.</p>
  <p><strong>so i have a setup of Mongo database where i have 4 shards running in replicaset.</strong></p>
  <pre><code>shard-1 == Server 1 (Primary), shard-1 Server 2 (Secondary), shard-1 - Server 3 (Secondary)
  shard-2 == Server 4 (Primary), shard-2 - Server 5(Secondary), shard-2 - Server 6(Secondary)
  shard-3 == Server 7 (Primary), shard-3 - Server 8(Secondary), shard-3 - Server 9(Secondary)
  </code></pre>
  <p>i have single database and single collection, so assuming that is distributed across all 3 shards as chunks and balancer is doing it's job right?</p>
  <p>so in such case if shard-1(cluster) goes down, will traffic movement will be normal or will be hampered.</p>