Amazon 클라우드 RDS의 Multi Zone Replication

AWS의 Zone은 같은 지역에 있는 물리적으로 다른 데이타 센터의 개념을 이야기 함.

RDS의 Multi Zone replication은 한 데이타 센터가 고장 나더라도 다른 데이타 센터에서 서비스가 가능한 구조.

기본적으로  Active-Stand by 형태로 복제하다가, 장애가 나면 stand by 서버로 fail over하는 구성

중요한 것중 하나는 MySQL RDS의 경우 자동 Back 시, 시스템이 일시적으로 멈추는 현상이 보이는데, Multi AZ deploy의 경우, back up시에, 자동 fail over하여, 멈추는 현상 없이 서비스가 가능함

http://aws.amazon.com/ko/about-aws/whats-new/2010/05/18/announcing-multi-az-deployments-for-amazon-rds/

Announcing Multi-AZ Deployments for Amazon RDS

We are excited to announce Multi-Availability Zone (Multi-AZ) deployments for Amazon Relational Database Service (Amazon RDS). This new deployment option provides enhanced availability and data durability by automatically replicating database updates between multiple Availability Zones. Availability Zones are physically separate locations with independent infrastructure engineered to be insulated from failure in other Availability Zones. When you create or modify your DB Instance to run as a Multi-AZ deployment, Amazon RDS will automatically provision and maintain a synchronous “standby” replica in a different Availability Zone. In the event of planned database maintenance or unplanned service disruption, Amazon RDS will automatically failover to the up-to-date standby so that database operations can resume quickly without administrative intervention.

The increased availability and fault tolerance offered by Multi-AZ deployments are well suited to critical production environments. To learn more, visit the Amazon RDS product page.