Help Center/ Object Storage Service/ .NET SDK Developer Guide (Ally Region)/ Bucket Management/ Setting or Obtaining the Storage Class of a Bucket
Updated on 2026-01-16 GMT+08:00
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Setting or Obtaining the Storage Class of a Bucket

OBS allows you to set storage classes for buckets. The storage class of an object defaults to be that of its residing bucket. Different storage classes meet different needs for storage performance and costs. There are three types of storage class for buckets, as described in the following table:

Storage Class

Description

Value in OBS .NET SDK

OBS Standard

Features low access latency and high throughput and is applicable to storing frequently-accessed (multiple times per month) hotspot or small objects (< 1 MB) requiring quick response.

StorageClassEnum.Standard

OBS Warm

Is applicable to storing semi-frequently accessed (less than 12 times a year) data requiring quick response.

StorageClassEnum.Warm

OBS Cold

Is applicable to archiving rarely-accessed (once a year) data.

StorageClassEnum.Cold

Intelligent Tiering

Is designed to optimize storage costs by automatically moving data to a more economical access tier when data access patterns change. This storage class is ideal for data with constantly changing or unpredictable access patterns.

StorageClassEnum.INTELLIGENTTIERING

For more information, see section "Storage Classes" in the Object Storage Service User Guide.

Setting the Storage Class for a Bucket

You can call ObsClient.SetBucketStoragePolicy to set the storage class for a bucket. Sample code is as follows:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);
// Set the storage class for a bucket.
try
{
    SetBucketStoragePolicyRequest request = new SetBucketStoragePolicyRequest
    {
        BucketName = "bucketname",
        StorageClass = StorageClassEnum.Cold,
    };
    SetBucketStoragePolicyResponse response = client.SetBucketStoragePolicy(request);
    Console.WriteLine("Set bucket storage policy response: {0}", response.StatusCode);
}
catch (ObsException ex)
{
    Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
    Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
}

Obtaining the Storage Class of a Bucket

You can call ObsClient.GetBucketStoragePolicy to obtain the storage class. Sample code is as follows:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);
// Obtain the storage class of a bucket.
try
{
    GetBucketStoragePolicyRequest request = new GetBucketStoragePolicyRequest()
    {
        BucketName = "bucketName",
    };
    GetBucketStoragePolicyResponse response = client.GetBucketStoragePolicy(request);
    Console.WriteLine("Get bucket storage policy response: {0}", response.StatusCode);
    Console.WriteLine("StorageClass: {0}", response.StorageClass);
}
catch (ObsException ex)
{
    Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
    Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
}
Parent topic: Bucket Management