This topic describes how to use Internet Shared Bandwidth and Data Transfer Plan to reduce Internet costs.
Data Transfer Plan
Data Transfer Plan is an Internet traffic package that is billed by using the subscription method. It offers a price lower than that of the pay-as-you-go billing method and provides off-peak data plans, which greatly reduce Internet traffic costs. Data Transfer Plan applies to ECS instances, Elastic IP Addresses (EIPs), and Server Load Balancer (SLB) instances that are billed by traffic.
After you purchase a Data Transfer Plan, the traffic you have used before will be covered by the plan and no additional operation is required. You can view the usage of Data Transfer Plan of different products on the Resource Packages page of the billing management center.
The following are a cost reduction example of Data Transfer Plan, the application scenarios, and the billing method of Data Transfer Plan:
Cost reduction example
Data Transfer Plan supports off-peak data plans with lower prices. Take Hong Kong as an example. The prices of pay-as-you-go traffic, full-time data plan, and off-peak data plan are as follows:
Assume that your cloud resources consume a total of 5 TB traffic in the Hong Kong region. The following table compares the costs of the preceding three data plans.
5 TB traffic in Hong Kong Unit price (yuan/GB) Total cost (yuan) Cost saved (yuan) Proportion of cost saved Pay-as-you-go traffic 1 5120 0 0 Full-time data plan 0.75 3727 1393 27.2% Off-peak data plan 0.51 2609 2511 49%
Scenarios of Data Transfer Plan
All ECS instances, EIPs, and SLB instances that are billed by traffic support Data Transfer Plan. In terms of cost reduction, Data Transfer plan saves more costs for resources with large traffic.
Billing of Data Transfer Plan
Each plan has a validity period. After a plan expires, the remaining traffic allowance in the plan cannot be used. We recommend that you choose a plan with an appropriate allowance based on the history usage of your service. You can purchase a small plan first and buy more in the future to avoid allowance wasting.
After you reach the allowance of a plan, traffic further used by the service is billed by using the pay-as-you-go method and the service is not interrupted.
If you have purchased multiple Data Transfer Plans, traffic in the Data Transfer Plan to expire first is used first.
Internet Shared Bandwidth
Internet Shared Bandwidth is an independent bandwidth product that provides high-quality multi-line BGP bandwidth and various billing methods. You can add EIPs to an Internet Shared Bandwidth instance so that the EIPs can share the bandwidth. You can associate EIPs with ECS instances of the VPC network, NAT Gateways, and SLB instances of the VPC network, so that these products can share the bandwidth of the Internet Shared Bandwidth instance.
Internet Shared Bandwidth provides multiple billing methods, such as 95th percentile billing and bandwidth-based billing. By using Internet Shared Bandwidth and different billing methods, you can effectively save bandwidth costs and experience elastic services.
The bandwidth sharing function of Internet Shared Bandwidth helps you reduce Internet bandwidth costs, especially in the case of great bandwidth fluctuations. Assume that you have 10 ECS instances in Hong Kong and all the ECS instances are associated with EIPs. You use bandwidth-based billing for the resources and set the peak bandwidth to 100 Mbit/s. For these 10 EIPs with the peak bandwidth of 100 Mbit/s, you must pay CNY 3253 per day.
However, traffic analysis of the 10 EIPs shows that the services on the 10 ECS instances differ in bandwidth fluctuations. The peak outbound bandwidth of the 10 servers is about 500 Mbit/s, as shown in the following figure.
In this case, you can use Internet Shared Bandwidth. You only need to buy a 500 Mbit/s Internet Shared Bandwidth instance for the 10 ECS instances to share a bandwidth. In this way, each ECS instance can use a peak bandwidth five times that of the 100 Mbit/s EIP, and you only need to pay CNY 1680 per day for the 500 Mbit/s Internet Shared Bandwidth instance. Thus, CNY 1573 is saved, which is 50% less costs than the EIP method.
Internet Shared Bandwidth also provides 95th percentile billing with unlimited peak bandwidth. The billing is based on the actual bandwidth usage excluding the abrupt peak bandwidth. This billing method not only saves bandwidth costs, but also reduces the impact of limited bandwidth on your service. For users with great bandwidth fluctuations, it is difficult to estimate a reasonable peak bandwidth. A high peak bandwidth causes wasting. A low peak bandwidth causes packet loss, and affects service development and user experience. For these users, 95th percentile billing is a better choice.
Therefore, if you have multiple EIPs and experience obvious bandwidth fluctuations, Internet Shared Bandwidth can help you save the cost greatly. If your services are frequented by abrupt bandwidth peaks, you can use the 95th percentile billing method to avoid the impact of limited peak bandwidth on your service and extra costs incurred by unnecessarily high peak bandwidth.
For services with stable traffic, you can choose the bandwidth-based subscription billing method, which can help you save 20% to 30% costs compared with bandwidth-based pay-as-you-go billing.
For services frequented by abrupt bandwidth peaks, you can choose 95th percentile billing.