Oracle Cloud和AWS 区域，可用区对比（20250123）

silence 2025-01-23

最近在OU上看OCI for AWS Architects 这门课。列出些OCI 和AWS 概念之间的一些区别：

第一节： Global Infrastructure. （全球基础设施）

OCI和AWS 全球基础设施专有名词对比：

OCI

Region：一个地理区域。Oracle在国内没有region。

Availability Domain: 一个或多个在Region中的数据中心。Regions 之间的传输，AD 之间的传输都是加密的。

AD 之间电力，冷却设备，网络都是相互独立的，一个AD的损坏不会影响到其他的AD。

Oracle 在全球25个国家提供了50个公有云regions。

Fault Domain: AD 中一组硬件和基础设施的组合。每一个AD 包含三个Fault Domain。用户可以将应用部署在不同的硬件上来避免应用的不可用。

An Oracle Cloud Infrastructure availability domain is:

One or more data centers located within a region. Availability domains are isolated from each other, fault tolerant, and very unlikely to fail simultaneously. Because availability domains do not share infrastructure such as power or cooling, or the internal availability domain network, a failure at one availability domain is unlikely to impact the availability of the others. All the availability domains in a region are connected to each other by a low latency, high bandwidth network.

An Oracle Cloud Infrastructure fault domain is:

A grouping of hardware and infrastructure within an availability domain. Each availability domain contains three fault domains. Fault domains let you distribute your instances so that they are not on the same physical hardware within a single availability domain. A hardware failure or Compute hardware maintenance that affects one fault domain does not affect instances in other fault domains.

Regions， Availability zone, Fault domain之间的关系。

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AWS

Regions: 一个地理区域。AWS 在国内有两个regions，一个在北京，一个在宁夏。每一个AWS Region 由最少3个隔离的AZs 组成。

Availability Zone: 每个AZ 由一个或多个数据中心（DC）组成，这些DC 各自有自己的电力，冷却系统。

Placement Groups: 在一个AZ中有多个Placement Groups 组成。一个应用可以部署在Placement Group的不同机器上来做高可用。

AWS has the concept of a Region, which is a physical location around the world where we cluster data centers. We call each group of logical data centers an Availability Zone. Each AWS Region consists of a minimum of three, isolated, and physically separate AZs within a geographic area. Unlike other cloud providers, who often define a region as a single data center, the multiple AZ design of every AWS Region offers advantages for customers. Each AZ has independent power, cooling, and physical security and is connected via redundant, ultra-low-latency networks. AWS customers focused on high availability can design their applications to run in multiple AZs to achieve even greater fault-tolerance. AWS infrastructure Regions meet the highest levels of security, compliance, and data protection.

An Availability Zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region. AZs give customers the ability to operate production applications and databases that are more highly available, fault tolerant, and scalable than would be possible from a single data center.

A cluster placement group is a logical grouping of instances within a single Availability Zone. Instances are not isolated to a single rack. A cluster placement group can span peered virtual private networks (VPCs) in the same Region. Instances in the same cluster placement group enjoy a higher per-flow throughput limit for TCP/IP traffic and are placed in the same high-bisection bandwidth segment of the network.

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