title: Does AWS ElastiCache Redis Multi-AZ with automatic failover helps keeping minimal downtime on scheduled maintenance?
body: <p>We're planning to use Redis (cluster mode disabled) in AWS ElastiCache.</p>
  
  <p>Multi-AZ with automatic failover feature helps keeping minimal downtime in case the primary node goes down.</p>
  
  <p>However, nothing is said about scheduled maintenance. I understand that different availability zones are in different places in region, but will failover work in case of maintenance? Will all nodes go down simultaneously or one by one with automatic failover? Will be data left intact?</p>
  
  <p><strong>Docs do not cover these questions.</strong> They just say I should pick a maintenance interval, they don't say what will happen with my data.</p>