Availability Zone
An isolated data center location within a cloud region designed to provide fault tolerance and high availability.
Also: AZ
Definition
An Availability Zone (AZ) is one or more discrete data center locations within a cloud provider's region, each with redundant power, cooling, and networking. By distributing applications across multiple AZs, organizations protect against data center failures ”” if one AZ goes down, others continue serving traffic. AWS, Azure, and GCP all offer multiple AZs per region. High-availability architectures deploy resources across at least two AZs, often with active-active or active-passive failover configurations.
Example
“A web application deployed across 3 AWS Availability Zones continues operating without interruption when a power outage takes one AZ offline.”
Usage Examples
- 1
“The team applied availability zone best practices to improve their cloud computing outcomes significantly.”
- 2
“Understanding availability zone is essential for anyone building a career in IT & Technology.”
When & How to Use
Use 'Availability Zone' when working in Cloud Computing contexts where an availability zone (az) is one or more discrete data center locations within a cloud provider's region, each with redundant power, cooling, and networking.
- ▸Applying availability zone principles during a cloud computing project or initiative
- ▸Explaining availability zone to a junior team member or stakeholder unfamiliar with IT & Technology
- ▸Evaluating options or proposals using availability zone as a decision-making criterion
Etymology & Origin
The term 'Availability Zone' derives from professional usage and entered IT & Technology professional usage as the field formalised in the 20th century.
History & Evolution
The concept of availability zone has evolved alongside IT & Technology. Early practitioners relied on informal methods; structured approaches emerged with the professionalisation of cloud computing in the mid-20th century. Today, availability zone is a standard part of IT & Technology practice globally.
Synonyms
- fault domain
- data center zone
- cloud zone
Antonyms / Opposites
- single point of failure
Images
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Related Terms
- high-availability
- cloud-region
- failover
- disaster-recovery