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Classification by EBS Disk Performance

According to the performance, EBS disks can be classified into the following categories:

Capacity EBS Disk (not advocated): Commonly used in scenarios with massive storage and low I/O requirements, such as data backup.
Common EBS Disk: Commonly used in scenarios with low I/O requirements, such as data warehouse and log processing. The cost is low.
Efficient EBS Disk: Commonly used in scenarios with medium I/O requirements, such as small database.
Ultra-efficient EBS Disk: Commonly used in scenarios with high I/O requirements, such as medium-large size RDS, Oracle, and SQL Server.
SSD EBS Disk: Commonly used for I/O intensive applications with high demand for performance and latency, such as medium-sized relational database, NoSQL database, distributed applications, and big data analysis.
SSD Local EBS Disk: With ultra-high performance, it is an EBS disk created based on the local SSD disk device on the host of ECS. It can be applied to business scenarios with high demand for I/O performance and provides instances with access to local storage.

Classification by EBS Disk Purpose

According to the purposes, EBS disks can be classified into system disks and data disks:

System Disk

System disks can be created only with the creation of ECS instances and not created separately. When you create an ECS instance, a system disk of 20 G to 120 G will be created by default. System disks are released along with the instances. The system disk types used by different types of ECS are shown in the following table.


Instance Type	Specification Family Name	System Disk Type	CPU Type
SSD ECS	SSD s4	SSD EBS	Intel Xeon Broadwell (v4)
Capacity ECS	General g4	Capacity EBS	Intel Xeon Broadwell (v4)
GPU ECS	GPU p1	SSD EBS	Intel Xeon Broadwell (v4)
GPU ECS	GPU v1	SSD EBS	Intel Xeon® Skylake
Computing ECS	Computing c4	Common EBS	Intel Xeon Broadwell (v4)
General ECS	General g5	Common EBS	Intel Xeon® Skylake
Computing ECS	Computing c5	Common EBS	Intel Xeon® Skylake

Data Disk
Data disks can be created with the creation of ECS instances or created separately. A maximum of five data disks can be mounted to an ECS instance. When a data disk is created with an instance, its life cycle is the same as that of the instance and is released along with the instance. Data disks created separately can be released separately and also set to be released along with the ECS instances. Data disks can be created freely according to the disk types supported in each region.

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Classification by EBS Disk Performance
Classification by EBS Disk Purpose