What infrastructure actually costs and how to bring it down.
2 items at advanced level · all topics
A company runs a business-critical application in one AWS Region. The disaster recovery plan requires a recovery time objective of 10 minutes and a recovery point objective of 1 minute in a second Region. The company wants to avoid paying for a full duplicate of the production fleet. Which disaster recovery strategy should a solutions architect choose?
RTO and RPO in minutes rule out backup and restore and pilot light, because both require standing infrastructure up before traffic can move. Warm standby keeps a scaled-down copy always running, which is what buys minutes instead of hours without paying for a second full fleet.
A VPC spans three Availability Zones, each with a private subnet running application instances. All three private subnets route internet-bound traffic through a single NAT gateway in the first Availability Zone. A solutions architect must remove the dependency on that one Availability Zone and reduce cross-Availability Zone data transfer charges. What should the architect do?
A NAT gateway lives in one Availability Zone, so routing all three subnets through it creates both a single point of failure and a cross-zone data transfer charge on most of the traffic. Deploying one NAT gateway per Availability Zone fixes both problems at once.