Lesson 2: OCI Architecture
OCI Architecture
OCI Regions
Region is localized geographic area, comprised of one or more Availability Domains (AD).
Availability Domains
ADs is one or more fault-tolerant, isolated data centers located within a region, but connected to each other by a low latency, high bandwidth network.
Fault Domains
3 FDs in one AD.
Grouping of hardware and infrastructure within an AD to provide anti-affinity (logical data center) 故障域是在AD中用于提供反关联性1的硬件和基础结构的分组，FD也称为逻辑数据中心 .
Not share single points of hardware failure such as same physical server, physical rack or power distribution unit. 不共享单个硬件故障点，例如同一物理服务器，物理机架或配电单元。
High Availability Design
Region is launched one by one new geograpgique likes US, UK, CN with one AD 一个Region建立在一个新的地理区域，并只含一个AD
For any region with one AD, a second AD is used to enable further option for Disaster Recovery and Data Residency within a year 对于只含一个AD的Region, 第二个备用AD在一年内提供灾难恢复和数据驻留服务
Avoid single points of failure
different FDs in one AD in one Region
To avoid single points of failure, first thing should you have always multiple instances of the same type. So you have a second copy application in the second FD. They are all stateless.
Don't put it in the same FD, because this FD can be unavailable as well.
In different ADs for multiple Regions
Between 2 ADs, we use Data Guard to manage data. And in this case, if your whole AD1 becomes unavailable, you still have your same application up and running in AD2, because you're replicating your data to AD2 in the same Region, that's saying avoid single points of failure.
Compartments
A compartment is a collection of related resources. It helps you isolate and control access to your resources.
Each resource belongs to a single compartment
Resources can interact with other resources in different compartments
Resources and compartments can be added and deleted anytime
Resources can be removed from one compartment to another
Resources from multiple regions can be in the same compartment
Compartments can be nested, 嵌套 (six levels)
Access control by writing Policies
Analyze cost and assign budget for resources in compartments
1: 反关联性规则, 比如将一组虚拟机放置在不同的主机上，这样可以防止所有虚拟机在单个主机发生故障时立即发生故障
OCI Architecture
OCI Regions
Region is localired geographic area, comprised of one or more Availablity Domains (AD).
Availability Domains
ADs is one or more fault-tolerant, isolated data centers located within a region, but conntected to each other by a low latency, high bandwidth network.
Fault Domains
3 FDs in one AD.
Grouping of hardware and infrastructure within an AD to provide anti-affinity (logical data center) 故障域是在AD中用于提供反关联性1的硬件和基础结构的分组，FD也称为逻辑数据中心 .
Not share single points of hardware failure such as same physical server, physical rack or power distribution unit. 不共享单个硬件故障点，例如同一物理服务器，物理机架或配电单元。
High Availability Design
Region is launched one by one new geograpgique likes US, UK, CN with one AD 一个Region建立在一个新的地理区域，并只含一个AD
For any region with one AD, a second AD is used to enable further option for Disaster Recovery and Data Residency within a year 对于只含一个AD的Region, 第二个备用AD在一年内提供灾难恢复和数据驻留服务
Avoid single points of failure
In different FDs in one AD in one Region
To avoid single points of failure, first thing is you should always have multiple instances of the same type. So you have a second copy application in the second FD. They are all stateless. Don't put it in the same FD, because this FD can be unavailable as well.
In different ADs for multiple Regions
Between 2 ADs, we use Data Guard to manage data. And in this case, if your whole AD1 becomes unavailable, you still have your same application up and running in AD2, because you're replicating your data to AD2 in the same Region, that's saying avoid single points of failure.
Compartments
A compartment is a collection of related resources. It helps you isolate and control access to your resources.
Each resource belongs to a single compartment
Resources can interact with other resources in different compartments
Resources and compartments can be added and deleted anytime
Resources can be removed from one compartment to another
Resources from multiple regions can be in the same compartment
Compartments can be nested, 嵌套 (six levels)
Access control by writing Policies
Analyze cost and assign budget for resources in compartments
1: 反关联性规则, 比如将一组虚拟机放置在不同的主机上，这样可以防止所有虚拟机在单个主机发生故障时立即发生故障
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