title: What does "quorum reached" in redis logs? what technically it means?
body: <p>What does "quorum reached" in redis logs technically what it indicates, is it problem? Am I missing anything to tuning in redis.conf parameter to fix it?</p>
  
  <p><strong>Redis log message:</strong></p>
  
  <pre><code>Marking node a523100ddfbf844c6d1cc7e0b6a4b3a2aa970aba as failing (quorum reached).
  837:M 05 May 10:30:22.216 # Cluster state changed: fail
  </code></pre>