The single-disk performance of the Enhanced SSD is composed of the baseline performance and the additional performance, where:
- Baseline performance is linearly related to the cloud disk capacity and reaches the maximum baseline performance at the critical point.
- If you have requirements that exceed the benchmark performance, you can enable the extra performance to obtain the higher single-disk performance.
This document will introduce the benchmark performance and extra performance separately.
Total Performance of an Enhanced SSD
The performance of each enhanced SSD consists of benchmark performance and extra performance. Regardless of how it is allocated, the performance of the current enhanced SSD follows the following rules:
| Performance of Enhanced SSD | Maximum Value |
|---|---|
| Random IOPS | 100000 |
| Maximum throughput (MB/s) | 1000 |
Baseline Performance of Enhanced SSD
For enhanced SSD, the benchmark performance varies linearly with capacity and cannot be adjusted independently. The calculation formula is as follows:
| Baseline Performance of Enhanced SSD | Calculation Formula for Benchmark Performance | Maximum Value of Benchmark Performance |
|---|---|---|
| Benchmark Performance - Random IOPS | min {1800 + Capacity (GiB) × 50, 50000} | 50000 |
| Benchmark Performance - Maximum Throughput (MB/s) | min {120 + Capacity (GiB) × 0.5, 350} | 350 |
It can be calculated from the above formula:
- When the capacity reaches 460 GiB, the upper limit of throughput is reached first. At this point, the baseline performance values are: 24,800 random IOPS and 350 MB/s maximum throughput.
- When capacity reaches 964 GiB, the random IOPS reaches its upper limit. At this point, the baseline performance values are: 50,000 random IOPS and 350 MB/s maximum throughput.
Additional Performance of Enhanced SSD
If you have requirements that exceed the maximum value of benchmark performance, you can enable the extra performance to obtain the higher performance.
Prerequisites
The following conditions must be met to enable the extra performance:
- Currently, this feature is only available to Enhanced SSD and Tremendous SSD, other types of cloud disk do not support extra performance.
- Only when any item of baseline performance reaches its maximum value can additional performance be configured. According to the baseline performance calculation formula, it is supported only when the capacity is higher than 460 GiB.
Extra Performance Formula
Extra performance is configurable by the user, and the calculation formula is as follows:
| Additional Performance of Enhanced SSD | Extra Performance Formula | Maximum Value of Extra Performance |
|---|---|---|
| Random IOPS | min {configuration value × 128, 50000} | 50000 |
| Max throughput (MB/s) | min {configuration value × 1, 650} | 650 |
Example
Example 1: An Enhanced SSD with a capacity requirement of 2,000 GiB and a throughput requirement of 500 MB/s.
According to the baseline performance description, it can be seen that the baseline performance (throughput) has reached its upper limit of this configuration capacity. To meet the requirements, an additional performance of (500 - 350)/1 = 150 needs to be purchased. Therefore, the overall configuration to be purchased is: 2,000 GiB Enhanced SSD with additional performance configured as 150.
Example 2: An Enhanced SSD with a capacity requirement of 1,000 GiB and an IOPS requirement of 50,000.
According to the baseline performance description, it can be seen that the baseline performance (random IOPS) has reached its upper limit of this configuration capacity. However, since the user does not need more IOPS performance, there is no need to configure additional performance. Therefore, the overall configuration to be purchased is: 1,000 GiB Enhanced SSD without additional performance.