Retrieves a list of the resources available in a certain zone. You can use this method before you upgrade or downgrade the instance specifications or the system disk capacity.

Request parameters

Name Type Required Description
Action String Yes The name of this interface. Value: DescribeResourcesModification.
RegionId String Yes ID of the target region. For more information, call DescribeRegions to obtain the latest region list.
ResourceId String Yes Resource ID. For example, if the retrieved resources are instances, this parameter can be interpreted as InstanceId.
DestinationResource String Yes Target resource type. Optional values:
  • InstanceType: Instance type.
  • SystemDisk: System disk of an instance.
MigrateAcrossZone Boolean No Specifies whether to upgrade the instance among different clusters or not.

Default: False.

When the MigrateAcrossZone is set to True and you change the instance configuration according to the returned information, you must make sure that:
  • For a classic network type instance:
    • If you upgrade the Phased-out instance types, non-I/O optimized instances to I/O optimized instances, the instance-related intranet IP addresses, disk device names and license key of the instance may change. For a Linux instance, the system recognizes basic cloud disk (cloud) as xvda or xvdb, ultra cloud disk (cloud_efficiency) and SSD disk (cloud_ssd) as vda or vdb.
    • If your classic network instances are available in the instance type families, the private IP of the instances may change.

  • For a VPC-Connected instance:

    If you upgrade the Phased-out instance types, non-I/O optimized instances to I/O optimized instances, the disk device names and license key of the ECS may change. For a Linux instance,  the system recognizes basic cloud disk (cloud) as xvda or xvdb, ultra cloud disk (cloud_efficiency) and SSD disk (cloud_ssd) as vda or vdb.

OperationType String No Whether to upgrade or downgrade your resources. Optional values:
  • Upgrade: Upgrade resources.
  • Downgrade: Downgrade resources.
Default: Upgrade.
InstanceType String No Type of an instance. For more information, see Instance Type Family, or call DescribeInstanceTypes to obtain the latest type list. If you set DestinationResource to SystemDisk, you must specify InstanceType.

Response parameters

Name Type Description
AvailableZones Array of AvailableZones A collection of zone types.
AvailableZoneType
Name Type Description
RegionId String Region ID.
ZoneId String Zone ID.
Status String Resource status. Optional values:
  • Available: Resources are available.
  • SoldOut: Resources are unavailable.
AvailableResources Array of AvailableResourcesType A collection of available resource types.
AvailableResourcesType
Name Type Description
Type String Resource type. Optional values:
  • Zone: Zone.
  • IoOptimized: Whether the instance is I/O optimized or not.
  • InstanceType: Instance type.
  • SystemDisk: System disk.
  • DataDisk: Data disk.
  • Network: Network type of an instance.
SupportedResources Array of SupportedResourcesType A collection of supported available resource types.
SupportedResourcesType
Name Type Description
Value String Name of the Resource.
Status String Resource status. Optional values:
  • Available: Resources are available.
  • SoldOut: Resources are unavailable.
Min Integer Minimum limit of the resource. No value is returned if the parameter is null.
Max Integer Maximum limit of the resource. No value is returned if the parameter is null.
Unit Integer Resource type unit. No value is returned if the parameter is null.

Examples

Request example 
https://ecs.aliyuncs.com/?Action=DescribeResourcesModification
&RegionId=cn-hangzhou
&<Common Request Parameters>
https://ecs.example.com/?Action=DescribeResourcesModification
&RegionId=cn-hangzhou
&<Common Request Parameters>
Response example

XML format

<DescribeResourcesModificationResponse>
    <AvailableZones>
        <AvailableZone>
            <ZoneId>cn-hangzhou-d</ZoneId>
            <RegionId>cn-hangzhou</RegionId>
            <Status>Available</Status>
            <AvailableResources>
                <AvailableResource>
                    <Type>instanceType</Type>
                    <SupportedResources>
                        <SupportedResource>
                            <Value>ecs.d1ne.xlarge</Value>
                            <Status>Available</Status>
                        </SupportedResource>
                         <SupportedResource>
                            <Value>ecs.d1ne. 2xlarge</Value>
                            <Status>Available</Status>
                        </SupportedResource>
                    </SupportedResources>
                </AvailableResource>
            </AvailableResources>
        </AvailableZone>
        <AvailableZone>
            <ZoneId>cn-hangzhou-e</ZoneId>
            <RegionId>cn-hangzhou</RegionId>
            <Status>Available</Status>
            <AvailableResources>
                <AvailableResource>
                    <Type>instanceType</Type>
                    <SupportedResources>
                        <SupportedResource>
                            <Value>ecs.d1ne.xlarge</Value>
                            <Status>Available</Status>
                        </SupportedResource>
                         <SupportedResource>
                            <Value>ecs.d1ne. 2xlarge</Value>
                            <Status>Available</Status>
                        </SupportedResource>
                    </SupportedResources>
                </AvailableResource>
            </AvailableResources>
        </AvailableZone>
    </AvailableZones>
    <RequestId>6DB97BCC-92BA-424D-A7C8-3F6486612BAE</RequestId>
</DescribeResourcesModificationResponse>
JSON format 
{
    "RequestId": "D0233A65-7F00-4B50-8023-101427229D4F",
    "AvailableZones": {
        "AvailableZone": [
            {
                "Status": "available",
                "RegionId": "cn-hangzhou",
                "AvailableResources": {
                    "AvailableResource": [
                        {
                            "Type": "instanceType",
                            "SupportedResources": {
                                "SupportedResource": [
                                    {
                                        "Status": "available",
                                        "Value": "ecs.sn1ne.xlarge"
                                    },
                                    {
                                        "Status": "available",
                                        "Value": "ecs.sn2ne.xlarge"
                                    }
                                ]
                            }
                        }
                    ]
                },
                "ZoneId": "cn-hangzhou-e",
            }
        ]
    }
}

Error codes

Error codes specific to this interface are as follows. For more information, see API Error Center.

Error code Error message HTTP status code Description
Invalid.Param The input parameter DestinationResource that is mandatory for processing this request is not supplied. 400 You must specify the parameter DestinationResource.
Unavailable.Regions The available regions does not exists. 404 The specified RegionId is unavailable.
InvalidRegionId.NotFound The specified RegionId does not exist. 404 The specified RegionId does not exist.