Module 16
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Failures can be small scale (server stops), large scale (many resources across AZ's stop) or global (Aliens).
RPO is the maximum acceptable amount of data loss, measured in time
The last backup was made at 8pm. The disaster happens 8 hours later. We have lost 8 hours of data
RTO is the maximum acceptable amount of time after a disaster strikes that a business process can remain out of commission
The last backup was made at 8pm. The disaster happened 8 hours later. We only have 1 hour to recover the application
Is a system of prevention and recovery from potential threats to a company and consists of the following:
Business impact analysis
Risk assessment
Disaster recovery plan
Evaluated and determined RPO and RTO
Disaster recovery plans should span more than one region
If all of our data is in the cloud we can configure cross-region replication
With EBS Volumes
Made for resiliency and recovery
Use templates to quickly deploy collections of resources as needed
Manage and deploy applications across fleets.
Duplicate production environments in a new Region or virtual private cloud (VPC) in minutes.
Backup and restore is a suitable approach for mitigating against data loss or corruption. it can take a long time to restore your system when a disaster occurs. Cheapest
Hybrid storage service that enables your on-premises applications to use AWS Cloud storage
A minimal backup version of your environment is always running. The pilot light analogy comes from a gas heater: a small flame (or the pilot light) is always on, even when the heater is off. The pilot light can quickly ignite the entire furnace to heat a house
The secondary cannot handle the entire load of the primary and will need to scale quickly to handle traffic
The warm standby pattern is like the pilot light, but more resources are already running. The warm standby solution extends the pilot light elements and preparation. It further decreases the recovery time because some services are always running.
These servers can be running on a minimum-sized fleet of EC2 instances with the smallest sizes possible.
You have a fully functional system that runs in a second Region. It runs at the same time as the on-premises systems or the systems that run in a different Region.
