ApsaraDB for MyBase offers several storage options for your instances, including local SSDs, ESSDs. This topic compares these storage types to help you choose the right option for your workload.
Storage type overview
Type | Description |
ESSD | Enhanced SSDs (ESSDs) are ultra-high performance cloud disks offered by Alibaba Cloud. Built on a next-generation distributed block storage architecture, ESSDs use 25GE networking and Remote Direct Memory Access (RDMA) technology. This design delivers up to 1 million random read/write IOPS per disk and provides lower latency. ESSDs are available in the following performance levels (PLs):
|
local SSD | A local SSD is a solid-state drive located on the same host as the database engine. This proximity provides very low I/O latency. |
View storage type
View an instance's storage type on its Basic Information page.
Storage type comparison
Table 1. Feature comparison
Type | I/O performance | Configuration flexibility | Scalability |
local SSD | ★★★★★ Low I/O latency and high performance. | ★★★★★ Offers multiple configuration options. You can expand disk space independently. Scaling down is not supported. | ★★★ Instance scaling requires data migration, which can take several hours. |
ESSD (Recommended) | ★★★★★ Significant performance improvement over SSD cloud disks. | ★★★★★ Supports online upgrades and scaling that completes in minutes. |
Storage types supported by database engines
Database engine | Host storage type |
MySQL |
|
SQL Server |
|
PostgreSQL | ESSD |
Redis | ESSD |