anchor.diff:  This topic describes the components used to ensure high availability in <%= vars.app_runtime_full %>, vertical and horizontal scaling, and the infrastructure required to support scaling component VMs for high availability.
   
   
  -## <a id='components'></a> Components of a High Availability Deployment
  -
  -This section describes how to ensure high availability for your deployment with the following components:
  -
  -* Availability zones. See [Availability Zones](#azs).
  -* External load balancers. See [External Load Balancers](#external-lbs).
  -* Blob storage. See [Blob Storage](#blobstore).
  -
  -### <a id='azs'></a> Availability Zones
  +## <a id='azs'></a> Availability Zones for High Availability
   
   Availability Zones (AZs) are locations where public cloud services offer data centers. 
   
  
positive.code: A deployment with three or more availability zones operates uninterrupted when entire AZs become unavailable. For example, a three-AZ deployment stays available when one entire AZ goes down, and a five-AZ deployment stays available during an outage of up to two AZs.
  
  
  ### <a id='external-lbs'></a> External Load Balancers
  
  To ensure high availability for a production environments, use a highly-available customer-provided load balancing solution that does the following:
  
  
negative.code: 
  You can horizontally scale most <%= vars.product_short %> components to multiple instances to achieve the redundancy required for high availability. 
  
  You should also distribute the instances of components with multiple instances across different AZs to minimize downtime during ongoing operation, product updates, and platform upgrades. If you use more than three AZs, ensure that you use an odd number of AZs.
  
  <%= vars.scaling_ert %>
  
  <%= partial vars.scale_table %>
  
  
  ## <a id='supporting-scaling'></a> Support Component Scaling
  
  The ability to vertically scale component VMs is important for high availability. 
  
  To scale component VMs, you must ensure that the surrounding infrastructure of your deployment supports VM scaling.
  
  This section describes the infrastructure required to support scaling component VMs for high availability.
  
  <% if vars.platform_code == 'CF' %>
  <%= vars.max_in_flight_header %>
  