Elastic and Fixed Specifications
Differences
When you create a dedicated load balancer, you can select elastic or fixed specifications based on your service requirements. Table 1 lists the differences between the two specifications.
Item |
Elastic |
Fixed |
---|---|---|
Application scenarios |
|
|
Billing mode |
Pay-per-use |
|
Billing Item |
|
LCU |
Capabilities |
Same |

Available specifications are displayed on the console and may vary depending on the resources in different regions.
ELB Specifications and Performance
Load balancers are available in different specifications as described in Table 2. Choose the specifications that best meet your needs. When traffic exceeds what defined in your selected specifications, new requests will be discarded.
The load balancer performance increases with the number of AZs. Elastic Specifications and Fixed Specifications show the maximum performance of a load balancer in a single AZ.
Dimension |
Description |
---|---|
Connections per second (CPS) |
The number of new connections that a load balancer can establish per second. If the number reaches the CPS that is defined in the elastic specifications, new requests will be discarded to ensure the performance of established connections. |
Maximum Connections |
The maximum number of concurrent connections that a load balancer can handle. If the number reaches the maximum connections that is defined in the elastic specifications, new requests will be discarded to ensure the performance of established connections. |
Queries per second (QPS) |
The number of HTTP or HTTPS requests sent to a backend server per second. If the QPS reaches that is defined in the elastic specifications, new requests will be discarded to ensure the performance of established connections. |
Bandwidth (Mbit/s) |
The maximum amount of data that can be transmitted over a load balancer per second. |
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