AZ-900:Describe cloud concepts ④

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学習内容

Describe the benefits of using cloud services
Describe the benefits of high availability and scalability in the cloud

• 学習内容
• High availability
• Scalability
• Vertical scaling
• Horizontal scaling

High availability

Availability of resources when need is important.
→High availability focuses on ensuring maximum availability.

Azure is a highly available cloud environment with uptime guarantees.
The guarantees are part of service-level-agreements (SLAs).

What is SLAs?

• Formal agreement between service providers and customer that guarantees the customer a stated level of service.

What SLAs mean for Azure

• Up time - Represented as percentage
  • Related to the service or application availability aka up time
    • If the service was always available to use == 100% up time
• Down time
  • When the service is unavailable
• Credit
  • Credit a customer may be entitled to if the SLA is not met.
• Each Azure service has its own SLA

Azure services’ uptime: mostly 99%~99.9%

99% == can be unavailable for up to…

• 1.6 hours / week
• 7.2 hours / month

99.9% == can be unavailable for up to…

• 10 min / week
• 43.2 minutes / month

Scalability

• Ability to adjust resources to meet demand.
• able to add more resources to better handle the increased demand, when systems are overwhelmed from a sudden peak traffic.
• No overpayment for services
  • As the cloud is a consumption-based model == pay only for what is used.
  • can reduced resources and costs if demand drops off

Comes in two varieties: vertical and horizontal.

Vertical-scaling
Focused on increasing or decreasing the capabilities of resources.

Horizontal-scaling
Adding or subtracting the number of resources

Vertical scaling

Vertical scale up
When more processing power is needed while developing an app

• adds more CPUs or RAM to the virtual machine

Vertical scale down
When you realized you had over-specified the needs

• lowers CPU or RAM specifications.

Horizontal scaling

Scaling out deployed resources (either automatically or manually)
If there is a sudden steep jump in demand.

Scaling out ex:

• add additional virtual machines or containers

Scaling in deployed resources (either automatically or manually)
If there is a significant drop in demand.

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AZ-900:Describe cloud concepts② はこちら：

AZ-900:Describe cloud concepts③ はこちら：

AZ-900:Describe cloud concepts⑤ はこちら：

AZ-900:Describe cloud concepts⑥ はこちら：

AZ-900:Describe cloud concepts⑦ はこちら：

AZ-900:Describe cloud concepts⑧ はこちら：

AZ-900:Describe cloud concepts⑨ はこちら：