Amazon Application Recovery Controller (ARC) zonal shift and zonal autoshift have expanded their capabilities and now support EC2 Auto Scaling. ARC zonal shift helps you quickly recover an unhealthy application in an Availability Zone (AZ), and reduce the duration and severity of impact to the application due to events such as power outages and hardware or software failures. ARC zonal autoshift safely and automatically shifts your application’s traffic away from an AZ when AWS identifies a potential failure affecting that AZ.
EC2 Auto Scaling customers can now shift traffic away from an AZ in the event of a failure. Zonal shift works with EC2 Auto Scaling by stopping dynamic scale-in, so that capacity is not unnecessarily removed and launching new EC2 instances in the healthy AZs only. In addition, you can set health checks to enabled in the impaired AZ or disable health checks in the impaired AZ. When disabled, it will pause unhealthy instance replacement in the AZ that has an active zonal shift. Enable your EC2 Auto Scaling Groups for zonal shift using the EC2 Auto Scaling console or API, and then trigger a zonal shift or enable autoshift via ARC zonal shift console or API. To learn more review the ARC documentation and read this launch blog.
There is no additional charge for using zonal shift or zonal autoshift. See the AWS Regional Services List for the most up-to-date availability information.
Source:: Amazon AWS