Help Center/ Elastic Volume Service/ API Reference (Paris Region)/ OpenStack Cinder APIs/ Disk Management/ Creating EVS Disks

Updated on 2024-03-26 GMT+08:00

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Creating EVS Disks

Function

This API is used to create one or multiple EVS disks.

URI

URI format
POST /v2/{project_id}/volumes

Parameter description

Parameter	Mandatory	Description
project_id	Yes	The project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

Parameter

Mandatory

Description

project_id

Yes

The project ID.

For details about how to obtain the project ID, see Obtaining a Project ID.

Request

Request parameters

Parameter	Type	Mandatory	Description
volume	Object	Yes	The information of the disk to be created. For details, see Parameters in the volume field.
OS-SCH-HNT:scheduler_hints	Object	No	The scheduling parameter. The dedicated_storage_id field is supported, indicating that the disk can be created in DSS storage pools.

Parameters in the volume field

Parameter	Type	Mandatory	Description
availability_zone	String	Yes	The AZ where you want to create the disk. If the specified AZ does not exist, the disk will fail to be created. NOTE: For details about how to obtain the AZ, see Querying All AZs.
source_volid	String	No	The source disk ID. If this parameter is specified, the disk will be cloned from an existing disk. This function is currently not supported.
description	String	No	The disk description, which can contain a maximum of 255 bytes.
snapshot_id	String	No	The snapshot ID. If this parameter is specified, the disk will be created from a snapshot. NOTE: For details about how to obtain the snapshot ID, see Querying Details About EVS Snapshots.
size	Integer	Yes	The disk size, in GB. The value can be as follows: System disk: 1 GB to 1024 GB Data disk: 10 GB to 32768 GB This parameter is mandatory when you create an empty disk. You can specify the parameter value as required within the value range. This parameter is mandatory when you create the disk from a snapshot. Ensure that the disk size is greater than or equal to the snapshot size. This parameter is mandatory when you create the disk from an image. Ensure that the disk size is greater than or equal to the minimum disk capacity required by min_disk in the image attributes.
name	String	No	The disk name, which can contain a maximum of 255 bytes.
imageRef	String	No	The image ID. If this parameter is specified, the disk will be created from an image. NOTE: BMS system disks cannot be created from BMS images. For how to obtain the image ID, see Querying Images in the Image Management Service API Reference.
volume_type	String	No	The disk type. The value can be SATA or SSD. SSD: the ultra-high I/O type SATA: the common I/O type If the specified disk type is not available in the AZ, the disk will fail to be created. NOTE: When the disk is created from a snapshot, the disk type of the new disk will be consistent with that of the snapshot's source disk. For details about disk types, see Disk Types and Performance in the Elastic Volume Service User Guide.
metadata	Object	No	The disk metadata. The length of key and value under metadata can contain no more than 255 bytes. For details about metadata, see Parameters in the metadata field. The table lists some fields. You can also specify other fields as required. NOTE: Parameter values under metadata cannot be null.
source_replica	String	No	The source disk ID. If this parameter is specified, the disk will be cloned from an existing disk. This function is currently not supported.
consistencygroup_id	String	No	The reserved field.
count	No	Integer	The number of disks to be created in a batch. If this parameter is not specified, only one disk will be created. You can create a maximum of 100 disks in a batch. If disks are created from backups, batch creation is not supported, and this parameter must be set to 1. If the specified value is a decimal, the number part of the value will be used.
shareable	String	No	The extended attribute that defines whether the disk will be shareable. The value can be true (shareable) or false (not shareable). This field is currently not supported. NOTE: This field is no longer used. Use multiattach.
multiattach	Boolean	No	Whether the disk is shareable. The default value is false. true: indicates a shared disk will be created. false: indicates a non-shared disk will be created.

Specifying any two of the source_volid, snapshot_id, and imageRef fields together is not supported.

Parameter in the OS-SCH-HNT:scheduler_hints field

Parameter	Type	Mandatory	Description
dedicated_storage_id	String	No	The DSS storage pool ID.

Parameters in the metadata field

Parameter	Type	Mandatory	Description
__system__encrypted	String	No	The encryption field in metadata. The value can be 0 (does not encrypt the disk) or 1 (encrypts the disk). If this parameter is not specified, the disk will not be encrypted.
__system__cmkid	String	No	The encryption CMK ID in metadata. This parameter is used together with __system__encrypted for encryption. The length of cmkid is fixed at 36 bytes. NOTE: For details about how to obtain the CMK ID, see Querying the Key List in the Key Management Service API Reference.
hw:passthrough	String	No	If this parameter is set to true, the disk device type will be SCSI, which allows ECS OSs to directly access the underlying storage media and supports SCSI reservation commands. If this parameter is set to false, the disk device type will be VBD, which supports only simple SCSI read/write commands. If this parameter is not specified, the disk device type will be VBD. NOTE: If parameter shareable is set to true and parameter hw:passthrough is not specified, shared VBD disks are created.
full_clone	String	No	If the disk is created from a snapshot and linked cloning needs to be used, set this parameter to 0.

The preceding table provides only some metadata parameters for your reference. You can also specify other fields as required.

If the disk is created from a snapshot, __system__encrypted and __system__cmkid are not supported, and the new disk will have the same encryption attribute as that of the snapshot's source disk.
If the disk is created from an image, __system__encrypted and __system__cmkid are not supported, and the new disk will have the same encryption attribute as that of the image.
If the disk is created from a snapshot, hw:passthrough is not supported, and the new disk will have the same device type as that of the snapshot's source disk.
If the disk is created from an image, hw:passthrough is not supported, and the device type of the new disk will be VBD.

Example request

{
    "volume": {
        "name": "openapi_vol01", 
        "imageRef": "027cf713-45a6-45f0-ac1b-0ccc57ac12e2", 
        "availability_zone": "az-dc-1", 
        "description": "create for api test", 
        "volume_type": "SAS", 
        "metadata": {
            "volume_owner": "openapi"
        },  
        "multiattach": false, 
        "size": 40
    }, 
    "OS-SCH-HNT:scheduler_hints": {
        "dedicated_storage_id": "eddc1a3e-4145-45be-98d7-bf6f65af9767"
    }
}

Response

Response parameters

Parameter	Type	Description
volume	Object	The information of the created disks. For details, see Parameters in the volume field.
error	Object	The error message returned if an error occurs. For details, see Parameters in the error field.

Parameters in the volume field

Parameter	Type	Description
id	String	The disk ID.
links	list	The disk URI. For details, see Parameters in the links field.
name	String	The disk name.
status	String	The disk status. For details, see EVS Disk Status.
attachments	list	The disk attachment information. For details, see Parameters in the attachments field.
availability_zone	String	The AZ to which the disk belongs.
bootable	String	Whether the disk is bootable. true: indicates a bootable disk. false: indicates a non-bootable disk.
encrypted	Boolean	This field is currently not supported.
created_at	String	The time when the disk was created. Time format: UTC YYYY-MM-DDTHH:MM:SS.XXXXXX
description	String	The disk description.
volume_type	String	The disk type. The value can be SATA or SSD. SSD: the ultra-high I/O type SATA: the common I/O type
replication_status	String	The reserved field.
consistencygroup_id	String	The ID of the consistency group where the disk belongs. This field is currently not supported.
source_volid	String	The source disk ID. This field is currently not supported.
snapshot_id	String	The snapshot ID.
metadata	Object	The disk metadata. For details, see Parameters in the metadata field.
size	Integer	The disk size, in GB.
user_id	String	The reserved field.
updated_at	String	The time when the disk was updated. Time format: UTC YYYY-MM-DDTHH:MM:SS.XXXXXX
shareable	Boolean	Whether the disk is shareable. NOTE: This field is no longer used. Use multiattach.
multiattach	Boolean	Whether the disk is shareable. true: indicates a shared disk. false: indicates a non-shared disk.
storage_cluster_id	String	The reserved field.

Parameters in the links field

Parameter	Type	Description
href	String	The corresponding shortcut link.
rel	String	The shortcut link marker name.

Parameters in the attachments field

Parameter	Type	Description
server_id	String	The ID of the server to which the disk is attached.
attachment_id	String	The ID of the attachment information.
attached_at	String	The time when the disk was attached. Time format: UTC YYYY-MM-DDTHH:MM:SS.XXXXXX
host_name	String	The name of the physical host housing the cloud server to which the disk is attached.
volume_id	String	The disk ID.
device	String	The device name.
id	String	The ID of the attached disk.

Parameters in the metadata field

Parameter	Type	Description
__system__encrypted	String	The encryption field in metadata. 0: indicates a non-encrypted disk. 1: indicates an encrypted disk. If this parameter does not appear, the disk is not encrypted.
__system__cmkid	String	The encryption CMK ID in metadata. This parameter is used together with __system__encrypted for encryption. The length of cmkid is fixed at 36 bytes.
hw:passthrough	String	The parameter that describes the disk device type in metadata. The value can be true or false. true indicates the SCSI device type, which allows ECS OSs to directly access the underlying storage media. SCSI reservation commands are supported. false indicates the VBD device type (the default type), which supports only simple SCSI read/write commands. If this parameter does not appear, the disk device type is VBD.
full_clone	String	The clone method. If the disk is created from a snapshot, value 0 indicates the linked cloning method.

Parameters in the error field

Parameter	Type	Description
message	String	The error message returned if an error occurs.
code	String	The error code returned if an error occurs. For details about the error code, see Error Codes.

Parameter

Type

Description

message

String

The error message returned if an error occurs.

code

String

The error code returned if an error occurs.

For details about the error code, see Error Codes.

Example response

{
    "volume": {
        "attachments": [ ], 
        "availability_zone": "az-dc-1", 
        "bootable": "false", 
        "consistencygroup_id": null, 
        "created_at": "2016-05-25T02:38:40.392463", 
        "description": "create for api test", 
        "encrypted": false, 
        "id": "8dd7c486-8e9f-49fe-bceb-26aa7e312b66", 
        "links": [
            {
                "href": "https://volume.localdomain.com:8776/v2/5dd0b0056f3d47b6ab4121667d35621a/volumes/8dd7c486-8e9f-49fe-bceb-26aa7e312b66", 
                "rel": "self"
            }, 
            {
                "href": "https://volume.localdomain.com:8776/5dd0b0056f3d47b6ab4121667d35621a/volumes/8dd7c486-8e9f-49fe-bceb-26aa7e312b66", 
                "rel": "bookmark"
            }
        ], 
        "metadata": {
            "volume_owner": "openapi"
        }, 
        "name": "openapi_vol01", 
        "replication_status": "disabled", 
        "multiattach": false, 
        "size": 40, 
        "snapshot_id": null, 
        "source_volid": null, 
        "status": "creating", 
        "updated_at": null, 
        "user_id": "39f6696ae23740708d0f358a253c2637", 
        "volume_type": "SAS"
    }
}

{
    "error": {
        "message": "XXXX", 
        "code": "XXX"
    }
}

In the preceding example, error indicates a general error, for example, badRequest or itemNotFound. An example is provided as follows:

{
    "badRequest": {
        "message": "XXXX", 
        "code": "XXX"
    }
}

Status Codes

Normal
202

Error Codes

For details, see Error Codes.

Parent topic: Disk Management

Previous topic: Disk Management

Next topic: Deleting an EVS Disk

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