Create an Alert-based Server Array

To create a server array, go to Manage -> Arrays and click on the New button.

Provide the following information:

• Nickname - provide a Nickname for the server array.
• Array type - select Alert-based as the type of server array.  (The secondary configuration options will change accordingly.)
• Server template - select the template that will be used to create the application servers in the server array.
• SSH key - select the SSH key that will be used by all servers in the server array.
• Security Group - select the security group that will be used by all servers in the server array.
• Deployment - select a deployment for the server array.  (A deployment can have more than one server array.)
• Default min count - the minimum number of servers that must be operational at all times in the server array. Default = 0.
• Default max count - the maximum number of servers that can be operational at the same time in the server array.
• Decision threshold - the percent of votes that must be made by all application servers in order to trigger an alert escalation and resize the server array. 
  • Example: Two application servers with a decision threshold = 51%.  An additional server will only be launched if both application servers "vote to grow."  Whereas, if the decision threshold = 50%, only one application server would have to "vote to grow" in order to launch an additional server.
• Resize by - the number of servers that should be added/removed from a server array when a resize action occurs.
• Resize calm time - the time (in minutes) that must pass before another action can be taken on the server array.  The calm time prevents an array from being resized too frequently.