Alibaba Cloud provides enhanced solid-state drives (SSDs) at different performance levels (PLs). Enhanced SSDs of PL1 are designed based on a new generation of distributed block storage architecture. These SSDs require the same price, but deliver higher input/output operations per second (IOPS), higher throughput, and more stable I/O performance than standard SSDs. Since June 30, 2021, Alibaba Cloud will no longer provide some instance configuration options with standard SSDs. This makes it easier for you to select the configuration of an ApsaraDB RDS instance.

End-of-sale product

Standard SSDs

End-of-sale date

June 30, 2021

Impacts and suggestions

  • When you purchase an RDS instance that runs one of the following database engines, you cannot select the standard SSD storage type:
    • MySQL
    • PostgreSQL
    • MariaDB
    Note The instance configuration options with standard SSDs are phased out gradually. You may still be able to select standard SSDs for these configuration options after June 31, 2021. However, we recommend that you select enhanced SSDs.
  • If your RDS instance uses standard SSDs, you can continue to use the configured standard SSDs. However, we recommend that you upgrade the storage type of your RDS instance to enhanced SSDs of PL1. This allows you to increase read and write performance at the same prices.
    Notice When you perform the following operations, ApsaraDB RDS upgrades the storage type of your RDS instance to enhanced SSDs of PL1. This upgrade does not incur additional fees.

Performance comparison between enhanced SSDs of PL1 and standard SSDs

Enhanced SSDs of PL1 require the same price as standard SSDs but deliver higher performance. The following table lists the specific performance differences.

Comparison item Enhanced SSD of PL1 Standard SSD
Maximum storage capacity per SSD (GiB) 20 to 32,768 32,768
Maximum IOPS 50,000 25,000
Maximum throughput (MB/s) 350 300
IOPS per SSD min{1800 + 50 × Storage capacity, 50000} min{1800 + 30 × Storage capacity, 25000}
Throughput per SSD (MB/s) min{120 + 0.5 × Storage capacity, 350} min{120 + 0.5 × Storage capacity, 300}
Average random write latency per connection (ms) 0.2 0.5 to 2