Before You Start

Overview

Welcome to Dedicated Distributed Storage Service API Reference. Dedicated Distributed Storage Service (DSS) provides you with dedicated storage pools which are physically isolated from other pools to ensure high security. With data redundancy and cache acceleration techniques, DSS provides highly reliable, durable, stable low-latency storage resources. By flexibly interconnecting with various compute services, such as Dedicated Computing Cluster (DCC), Elastic Cloud Server (ECS), and Bare Metal Server (BMS), DSS is perfect for high-performance computing (HPC), online analytical processing (OLAP), and mixed loads.

This document describes how to use application programming interfaces (APIs) to perform operations on DSS resources, such as creating, querying, deleting, and updating DSS resources. For details about all supported operations, see API Overview.

If you plan to access DSS through an API, ensure that you are familiar with DSS concepts. For details, see Service Overview.

After the storage pool is deployed and becomes available, you need to create disks in the storage pool. For details about disk APIs, see Elastic Volume Service API Reference.

API Calling

DSS supports Representational State Transfer (REST) APIs, allowing you to call APIs using HTTPS. For details about API calling, see Calling APIs.

Endpoints

An endpoint is the request address for calling an API. Endpoints vary depending on services and regions. For the endpoint of the DSS service, see Regions and Endpoints.

Concepts

• Account

  An account is created upon successful signing up. The account has full access permissions for all of its cloud services and resources. It can be used to reset user passwords and grant user permissions. The account is a payment entity, which should not be used directly to perform routine management. To ensure account security, create Identity and Access Management (IAM) users and grant them permissions for routine management.

• User

  An IAM user is created by an account in IAM to use cloud services. Each IAM user has its own identity credentials (password and access keys).

  API authentication requires information such as the account name, username, and password.

• Region

  Regions are divided based on geographical location and network latency. Public services, such as Elastic Cloud Server (ECS), Elastic Volume Service (EVS), Object Storage Service (OBS), Virtual Private Cloud (VPC), Elastic IP (EIP), and Image Management Service (IMS), are shared within the same region. Regions are classified into universal regions and dedicated regions. A universal region provides universal cloud services for common tenants. A dedicated region provides specific services for specific tenants.

  For details, see Region and AZ.

• AZ

  An AZ contains one or more physical data centers with independent power, cooling, fire suppression, and water systems. Within an AZ, compute, network, storage, and other resources are logically divided into multiple clusters. AZs within a region are interconnected using high-speed optical fibers to allow you to build cross-AZ high-availability systems.

• Project

  A project corresponds to a region. Default projects are defined to group and physically isolate resources (including computing, storage, and network resources) across regions. Users can be granted permissions in a default project to access all resources under their accounts in the region associated with the project. If you need more refined access control, create subprojects under a default project and create resources in subprojects. Then you can assign users the permissions required to access only the resources in the specific subprojects.

  Figure 1 Project isolation model
  
• Enterprise project

  Enterprise projects group and manage resources across regions. Resources in different enterprise projects are logically isolated. An enterprise project can contain resources of multiple regions, and resources can be added to or removed from enterprise projects.

  For details about enterprise projects and about how to obtain enterprise project IDs, see Enterprise Management User Guide.