A region is a geographic area where a cloud provider runs infrastructure, and an availability zone (AZ) is one or more isolated data centers within that region with separate power, cooling and networking so that failures stay contained.
Why it matters
Spreading an application across zones protects it from a single data center failure, while spreading across regions protects against larger events and puts servers closer to users in different countries.
Zones in a region are linked by fast, low-latency networks, so replication between them is practical. Cross-region replication is slower and often costs more.
Example
A web app runs two instances behind a load balancer, one in zone a and one in zone b of the same region. If zone a loses power, the load balancer stops sending traffic to it and zone b continues to serve users.
Common mistakes
- Placing every resource in one zone and calling it highly available.
- Ignoring data-transfer charges between zones and regions.
- Forgetting that some managed services are zonal and need explicit multi-zone setup.
Related
Get notified when this term updates
Plus occasional practical tips on uptime and monitoring, nothing else. Unsubscribe anytime.
यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.