Availability

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1. Overview

The quality attribute defines the percentage of time the system is available and ready to process requests.

The Registry Platform supports highly available deployment for central Platform components and Registry components.

High availability is achieved by using:

Active redundancy for critical components
Affinity and anti-affinity application distribution policies on cluster VMs
Automated load balancing to back up application instances
Rolling-approach to update deployments with minimal disruption for users

The described values are calculated for the Registry Platform deployment on two datacenters of availability zones, depending on the selected infrastructure.

Find more details on relevant subsystems and component technical design in the following chapters:

2. Target metrics

When defining target values for the aforementioned metrics, the classification of Registries, and operational conditions are taken into account.

To achieve these values, the Platform must be deployed on more than one datacenter.

Table 1. Registry target availability values
Metric	Registry class	Target value
Metric	Registry class	Production hours	Peak hours	Evening hours	Shadow hours
Availability	Strategic	`99.9%`	`99.9%`	`99.9%`	`95%`
	Tactical	`99.9%`	`99.9%`	`99.9%`	`95%`
	Operative	`99%`	`99%`	`99%`	`90%`