DRHCREL05-BP01 Provision spare compute capacity following an N+M model

Provision spare compute capacity following an N+M availability model, where N is the required capacity and M is the spare capacity to accommodate server failures. Use features like Amazon EC2 Auto Scaling groups, shared storage services, and AWS Elastic Disaster Recovery for reliable recovery.

Desired outcome: Achieve high availability with sufficient spare capacity and seamless failover capabilities in hybrid environments while consistently meeting data residency requirements, even during hardware failures or maintenance events.

Benefits of establishing this best practice: The N+M model improves availability and resilience by providing buffer capacity to handle unexpected server failures or maintenance events, minimizing downtime and maintaining consistent performance while meeting data residency requirements.

Level of risk exposed if this best practice is not established: High

Implementation guidance

Use placement groups with a spread strategy to improve reliability across hardware components. Prepare for network, instances, compute, racks or data centers, and Availability Zone or Region failure modes, and adopt highly-available design. Implement redundant network paths, and map application dependencies to understand the impact of disconnect events. Provide sufficient network redundancy to meet your application's availability requirements.