:Time-segmented elasticity assurances

Overview

A time-segmented elasticity assurance is a resource purchasing and usage model that balances flexibility with guaranteed availability, designed to provide capacity assurance for pay-as-you-go ECS instances. This model is ideal for daily elastic demands with irregular, short usage times and durations.

Use cases

• Predictable, tidal workloads: For example, daily traffic surges in the gaming and e-commerce industries, or peak traffic during holidays and non-working hours.

  

• Regular, periodic peak workloads: For example, peak hours for online education platforms or financial services during fixed business hours.

Lifecycle

Billing

When you use a time-segmented elasticity assurance, you must pay an upfront assurance fee. When you use the reserved capacity, you also incur ECS instance fees.

• Assurance fee: $$\frac{\text{Instance type subscription price}}{30\times 24}\times 10\%\times \text{Assurance period}$$

• ECS instance fees: Billed on a pay-as-you-go basis.

For example, if you want to assure capacity for an ecs.g7.2large instance in the China (Hong Kong) region for 8 hours, the assurance fee is calculated as follows: $$\frac{276.83}{30\times 24}\times 10\%\times 8$$ ≈ USD 0.31.

Create a time-segmented assurance

1. Log on to the ECS console.

2. In the left-side navigation pane, choose Deployment & Elasticity > > Elasticity Assurance.

3. On the Elasticity Assurance page, click Create Elasticity Assurance.

4. On the Create Elasticity Assurance page, configure the parameters for the time-segmented elasticity assurance and click Next.

   Parameter	Description
   Elasticity Assurance Name	Enter a name for the time-segmented elasticity assurance to help you identify it. The name must be 2 to 128 characters long. It must start with a letter or a Chinese character, and cannot start with http:// or https://. It can contain digits, colons (:), underscores (_), and hyphens (-).
   Region/Zone	Select the region and availability zone of the instance type you want to assure. You cannot change the Region/Zone after the time-segmented elasticity assurance is created.
   Instance Type	Select the instance type you want to assure.
   Capacity (Instances)	Specify the number of instances for which you want to assure capacity. Valid values: 1 to 1,000.
   Validity Period Starts	The time when the assurance becomes active. Options include: Now: The assurance becomes active immediately after it is created. Reserved resources are used to guarantee the availability of pay-as-you-go instances. Specify Effective Time: The assurance becomes active at a specified time after it is created. Reserved resources are used to guarantee the availability of pay-as-you-go instances.
   Duration (in Days)	Enter a positive integer from 1 to 365.
   Validity Period Start Time	If you set Validity Period Starts to Specify Effective Time, you must also set the Validity Period Start Time.
   Duplicated Rule	Recurrence policy: You can select one of the following recurrence rules: Daily: Select the recurrence interval in days. For example, every 2 days means the assurance takes effect once every two days within the assurance duration. Weekly: Select one or more days of the week on which the assurance will be active. Multiple days are supported. Monthly: Select a start and end day. For example, 1st to 6th means the assurance is active from the 1st to the 6th day of each month. Time: The start and end times must be on the hour and must be at least 4 hours apart.
   Private Pool Type	Open: A private pool that can be shared within your organization. Any instance that matches an open private pool can use its resources. You can also explicitly specify an open private pool at instance startup. Targeted: A private pool reserved for a specific scenario or service. You must explicitly specify the pool when you create the instance.
   Description	Enter a description for the time-segmented elasticity assurance to help you identify its purpose.
   Tag	You can add a tag when you create a time-segmented elasticity assurance. You can also enable tag matching for open private pools for more fine-grained resource management.

5. On the Preview page, confirm the assurance information, review the service notes and assurance fee, select I have read and understood the notes., and then click Submit.

Modify the recurrence rule

You can modify the assurance schedule of a time-segmented elasticity assurance only by calling the ModifyElasticityAssurance API operation. When you modify the schedule, the total assured duration must remain the same. You can modify the assurance schedule by changing the following parameters:

• RecurrenceType: The recurrence rule type for the time-segmented elasticity assurance. Valid values:

  • Daily: The assurance recurs daily.

  • Weekly: The assurance recurs weekly.

  • Monthly: The assurance recurs monthly.

• RecurrenceValue: The recurrence value for the time-segmented elasticity assurance.

  • If RecurrenceType is set to Daily, you can specify only one value from 1 to 31. For example, a value of 2 means the assurance recurs every two days.

  • If RecurrenceType is set to Weekly, you can specify multiple values separated by commas (,). The values for Sunday through Saturday are 0, 1, 2, 3, 4, 5, and 6, respectively. For example, a value of 1,2 means the assurance recurs on Mondays and Tuesdays.

  • If RecurrenceType is set to Monthly, the format is A-B. The values of A and B must be between 1 and 31, and B must be greater than or equal to A. For example, a value of 2-14 means the assurance recurs from the 2nd to the 14th day of each month.

• StartHour: The start time of the recurring assurance. This must be on the hour. The interval between StartHour and EndHour must be at least 4 hours.

• EndHour: The end time of the recurring assurance.

Modification examples

Share a time-segmented assurance

Capacity monitoring

Capacity monitoring shows the historical capacity data and usage of the time-segmented elasticity assurance.

1. Log on to the ECS console.

2. In the left-side navigation pane, choose Deployment & Elasticity > > Elasticity Assurance.

3. Click the ID of the time-segmented elasticity assurance, or click Details in the Operation column.

4. On the details page of the time-segmented elasticity assurance, click the Capacity Monitoring tab.

5. Select a start date and an end date to view the total capacity, used capacity, and utilization rate for the specified period.