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Simple Application Server:ResetDisk

Last Updated:Jan 15, 2026

Rolls back a disk based on a snapshot.

Operation description

  • You can call this operation only if the associated simple application server is in the Stopped state.

  • If you restore a disk from a snapshot, the incremental data after the snapshot is created is lost. We recommend that you back up the data before you perform this operation.

Precautions

Resetting the system or changing the image of a simple application server clears the disk data on the server. Snapshots created before the reset or change are retained but cannot be used to restore disks.

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

swas-open:ResetDisk

update

*Instance

acs:swas-open:{#regionId}:{#accountId}:instance/{#DiskId}

None None

Request parameters

Parameter

Type

Required

Description

Example

RegionId

string

Yes

The region ID of the simple application server for which the snapshot is created.

cn-hangzhou

DiskId

string

Yes

The ID of the disk to be rolled back.

d-bp14wq0149cpp2xy****

ClientToken

string

No

The client token that is used to ensure the idempotence of the request. You can use the client to generate the token, but you must make sure that the token is unique among different requests. The value of ClientToken can contain only ASCII characters and cannot exceed 64 characters in length. For more information, see How to ensure idempotence.

123e4567-e89b-12d3-a456-426655440000

SnapshotId

string

Yes

The snapshot ID.

s-bp16oazlsold4dks****

Response elements

Element

Type

Description

Example

object

RequestId

string

The request ID.

20758A-585D-4A41-A9B2-28DA8F4F534F

Examples

Success response

JSON format

{
  "RequestId": "20758A-585D-4A41-A9B2-28DA8F4F534F"
}

Error codes

HTTP status code

Error code

Error message

Description

500 InternalError An error occurred while processing your request.
403 IncorrectInstanceStatus.ResetDisk Rolling back the disk requires the instance to operate in a stopped state.
404 InvalidDiskId.NotFound The specified DiskId does not exist.
404 InvalidSnapshotId.NotFound The specified SnapshotId does not exist.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.