Guide to creating and using system disks-Elastic Compute Service(ECS)-阿里云帮助中心

Create, maintain, extend, and release system disks that store OS data for your ECS instances.

Common operations

The following figure shows common system disk operations during the disk lifecycle.

Create a system disk

A system disk can only be created together with an ECS instance and is automatically initialized. See Custom launch ECS instances.

Note

A cloud disk created from a system disk snapshot can only be used as a data disk.

Maintain a system disk

Scenario	References
View basic information and monitoring data of a system disk.	Query serial number View disk monitoring information
Back up and restore system disk data with snapshots.	Create a snapshot Roll back a cloud disk using a snapshot
Upgrade system disk specifications.	Change the category of a disk Change the performance level of an ESSD Modify the performance configuration of an ESSD AutoPL disk
Extend system disk storage capacity.	For Linux instances: Extend a disk (Linux) For Windows instances: Extend a disk (Windows)
Re-initialize a system disk to restore it to its initial state.	Re-initialize a system disk
Detach, repair, and re-attach a damaged system disk.	Detach or attach a system disk
Replace the system disk to change the operating system of an ECS instance.	Replace the system disk (operating system) of an instance
Tag system disks for search and management.	Modify disk tags

Release a system disk

System disks can only be released together with their ECS instances. The Release Disk with Instance feature is enabled by default.

Procedure

References

Release the ECS instance to release its system disk.

Create a snapshot

Release an instance

To retain the system disk when releasing an instance, disable Release Disk with Instance first. The system disk is then detached and retained as a data disk.

Release disk with instance

References

To clean up system disks regularly, see Periodically clean up disk space.

To move business data from a system disk to a data disk, see Store business data on Linux data disk.