The I/O performance burst feature for high-performance cloud disks has been popular since its launch because it decouples IOPS from storage space. In light of this, RDS is waiving all fees for this feature. For more information, see I/O performance burst for RDS for MySQL, I/O performance burst for RDS for PostgreSQL, and I/O performance burst for RDS for SQL Server.
Promotion period
Starts on April 16, 2024
The end date of the promotion will be announced separately.
Promotion details
The I/O performance burst feature is free of charge during the promotion. When billing resumes after the promotion, you will benefit from an increased free tier, as shown in the table below. You will only be charged for usage that exceeds this new limit. For specific pricing details, see Billing.
Instance type | Free tier |
Basic Edition instance | Increased from 100,000 IO/hour to 300,000 IO/hour |
High-availability Edition instance | Increased from 200,000 IO/hour to 600,000 IO/hour |
Cluster Edition instance | Increased from 500,000 IO/hour to 800,000 IO/hour |
Before the I/O performance burst fee waiver promotion ends, we will notify you about the upcoming billing changes via SMS, email, and internal messages.
Before this promotion ends, RDS for MySQL and RDS for PostgreSQL will introduce new features and policies with even more generous IOPS allowances. Stay tuned.
Billing
You are charged for I/O performance burst usage that exceeds the free tier for your high-performance cloud disk. The charges vary based on the instance type.
I/O performance burst unit price
CNY 0.02 per 10,000 IO
Overage is billed in 10,000 IO increments. Partial increments are rounded up to the next full increment.
Example
For example, consider a High-availability Edition instance with a burst usage of 602,000 IO in one hour. The fee is calculated as follows:
Actual IO burst usage | 602,000 IO/hour |
Free tier | 600,000 IO/hour |
Overage | 2,000 IO/hour |
Actual charges | 10,000 × (CNY 0.02 / 10,000 IO) = CNY 0.02 |
Billing method
The total fee for a high-performance cloud disk is calculated as: Storage Fee + I/O Performance Burst Fee.
The hourly I/O performance burst fee is calculated as: (Total I/O Performance Burst Usage - Free Tier) × Unit Price.
I/O performance burst for high-performance cloud disks only supports the pay-as-you-go billing method. Bills are generated hourly.
Example
RDS instance details: A High-availability Edition instance in the China (Beijing) region, with 1,000 GB of storage space and 50,000 baseline IOPS.
Assume that for 40 seconds within one hour, the instance bursts at 20,000 IOPS above its baseline. This pattern repeats hourly throughout the month.
The fees are calculated as follows:
Actual IO burst usage | 800,000 IO/hour |
Free tier | 600,000 IO/hour |
Overage | 200,000 IO/hour |
Actual charges/month | (200,000 / 10,000) × CNY 0.02 × 24 × 30 = CNY 288 |
The following is a cost comparison:
Storage type | Unit price | Storage fee | IO burst fee | Total fee |
high-performance cloud disk | 1,600 | 1,600 × 1 = 1,600 | 288 | 1,600 + 288 = 1,888 |
ESSD PL2 cloud disk | 3,200 | 3,200 × 1 = 3,200 | N/A | 3,200 |