ApsaraDB for MyBase provides the following types of data storage: local SSDs and enhanced SSDs (ESSDs). This topic describes a comparison between the storage types and provides suggestions for purchasing suitable disks.
Overview
| Storage type | Description |
|---|---|
| ESSD | ESSDs are a new type of high-performance disks developed by Alibaba Cloud based on the next-generation distributed block storage architecture. Each ESSD uses the 25 Gigabit Ethernet technology and the remote direct memory access (RDMA) technology to provide up to one million random IOPS and reduce one-way latency. ESSDs are classified into the following types based on the performance level (PL):
|
| Local SSD | Local SSDs are SSDs that are deployed on the same node as the database engine. You can use local SSDs to reduce I/O latency. |
View the storage type of an ApsaraDB for MyBase instance
Log on to the ApsaraDB for MyBase console and go to the Basic Information page of your ApsaraDB for MyBase instance. In the Basic Information section of the page, view Storage Type.
Comparison between storage types
| Storage type | I/O performance | Flexible specifications | Scalability |
|---|---|---|---|
| Local SSD | ★★★★★ Provides low I/O latency and high I/O performance. | ★★★★★ Provides various configuration options and allows you to increase the storage capacity of each disk. You cannot reduce the storage capacity. | ★★★ May require a few hours to copy data when you scale up the database system. |
| ESSD (recommended) | ★★★★★ Provides higher I/O performance than standard SSDs. | ★★★★★ Supports online scale-up and scale-out that can be completed within a few minutes. |
Storage types supported by database engines
| Database engine | Host storage type |
|---|---|
| MySQL |
|
| SQL Server |
|
| PostgreSQL | ESSD |