ApsaraDB RDS:RDS for PostgreSQL premium performance disks

Features

Premium performance disks are a new storage type supported by ApsaraDB RDS for PostgreSQL. They are compatible with all features of Enterprise SSDs (ESSDs). Premium performance disks also support IO performance burst, Buffer Pool Extension (BPE), and data archiving. These features provide higher input/output operations per second (IOPS) and queries per second (QPS) performance under high I/O pressure without requiring an increase in storage capacity.

• IO performance burst: If your business experiences frequent fluctuations and has many peak workloads, you can enable the IO performance burst feature. This feature allows the disk to temporarily exceed its maximum IOPS limit. This provides higher I/O capabilities during peak hours to meet sudden increases in business demand.

• Buffer Pool Extension (BPE): If a database encounters an I/O bottleneck due to large-scale or frequent data reads and writes, the BPE feature can significantly improve the database I/O performance.

• Data archiving: The data archiving feature lets you use Object Storage Service (OSS) to archive cold data. This significantly reduces storage costs.

Performance metrics

• I/O performance: The performance of a premium performance disk consists of baseline I/O performance and burst performance.

  Premium performance disk storage capacity	Baseline performance	Performance limit (Baseline + Burst)
  100 GB <= Storage capacity < 256 GB	I/O bandwidth: max {min{120 + 0.5 × storage capacity, 350}, 125} IOPS: max {min{1800 + 50 × storage capacity, 50000}, 3000}	I/O bandwidth: 16 KB × IOPS / 1024 MB/s IOPS: 1000 × storage capacity (GB)
  256 GB <= Storage capacity < 1000 GB		I/O bandwidth: 4096 MB/s IOPS: 1000 × storage capacity (GB)
  Storage capacity >= 1000 GB		I/O bandwidth: 4096 MB/s IOPS: 1,000,000

• Configuration flexibility: Multiple configurations are available, and you can scale the disk capacity out or in. Scale-in is supported only for ApsaraDB RDS for PostgreSQL instances that meet specific conditions. For more information, see Change instance configurations.

• Backup method: Snapshot backup

• Operation speed: Operations such as backups, read-only instance creation, and instance cloning take only seconds to complete.

• Scale-out duration: Scale-out is an online upgrade that takes only seconds to complete.

• Scale-out impact: None.

• Data durability: Provides 99.9999999% data reliability. To reduce costs, single-node Basic Edition instances are supported.

Limits

• Premium performance disks support a storage capacity range of 10 GB to 64,000 GB.

• You cannot change the storage type from a premium performance disk to any other type. However, you can change the storage type from an ESSD to a premium performance disk. For more information, see Change the storage type from ESSD to premium performance disk.

• Currently, you cannot download instance backup data for premium performance disks from the Data Backup tab. This tab is on the Basic Backup List page under Backup And Recovery.

Billing

Premium performance disk fee = RDS storage fee + IO performance burst fee + Buffer Pool Extension (BPE) fee + Data archiving fee

The Buffer Pool Extension (BPE) feature is currently free. The storage fee is calculated based on the purchased storage capacity. The IO performance burst fee and data archiving fee are calculated based on actual usage. For more information, see:

• The RDS storage fee is the same as that for PL1 ESSDs.

• IO performance burst billing

• Data archiving billing

Purchase a premium performance disk

You can purchase a premium performance disk for an ApsaraDB RDS for PostgreSQL instance in the following ways:

Related API operations