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- What's New
- Function Overview
- Product Bulletin
- Service Overview
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Billing
- Billing Overview
- Billing Modes
- Billing Items
- Billing Examples
- Billing Mode Changes
- Renewing Subscriptions
- Bills
- Arrears
- Billing Termination
- Cost Management
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Billing FAQ
- Why Do I Get Additional Charges or Arrears After Purchasing a Package?
- Why Can I Still Call the Service and Incur Arrears When My Account Balance Is Zero?
- Why Do I Get Additional Charges or Arrears After Unsubscribing from an OCR Service?
- Can I Refund a Package After I Buy It?
- How Is Billing Handled When a Package Is Used Up? And How Can I Check the Remaining Quota and Receive Alerts for My Package?
- How Does a Member Account Use a Package Purchased by an Enterprise Master Account?
- What Is Fee Deduction Order for Multiple Packages?
- What are Grace Period and Retention Period?
- What Is Considered Valid Billing for OCR?
- Can Different API Packages Be Shared?
- Can OCR Be Charged by Project?
- Getting Started
- User Guide
- SDK Reference
- API Reference
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FAQs
- Subscription
-
Token-based Authentication
- What Are the Username, Domain Name, and Project Name in the Token Message Body?
- Why Is the Error Message "The account is locked." Displayed?
- Why Is the Error Message "The username or password is wrong." Displayed?
- Why Does the Token Retrieval Process Return a 401 Status Code?
- Why Does the Token Fail to Be Obtained When I Use Postman to Call an ORC API?
- Why Don't I Have Programming Access Permissions?
- Why Does the Header Overflow When I Use Postman to Call an OCR API?
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API
- How Do I View the API Usage?
- Why Is the Actual Number of API Calls Inconsistent with the Record Displayed on the Management Console?
- Does OCR Support Batch Processing?
- Can the OCR Results Be Converted into Word, TXT, or PDF Files?
- How Do I Obtain the Base64 Code of an Image?
- What Is the Number of Concurrent OCR API Calls?
- How Do I Use OCR APIs?
- Can the Region Where OCR Is Called Be Different from the Region Where OBS Resources Are Located?
- Can the Input Data of OCR Be Stored Locally?
- How Do I Improve the Recognition Speed?
- How Do I Convert a PDF to an Image?
- Can OCR Read Images from Non-Huawei Cloud Storage?
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SDK
- Do OCR SDKs Need to Be Purchased?
- Do OCR SDKs Need Maven to Manage Dependency Packages?
- How Do I Change the Response Type in Returned Results?
- How Can I Fix an SSL Configuration Error?
- How Can I Fix a "connect timed out" Error?
- Why Does the Project ID Fail to Be Obtained?
- What Should I Do if I Forget My AK and SK?
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Error Code
- Why Do I Fail to Call an OCR API?
- How Do I Handle the Error APIG.0301?
- How Do I Handle the Error APIG.0201?
- How Do I Handle the Error APIG.0101?
- How Do I Handle the Error APIG.0106?
- How Do I Handle the Error APIG.0308?
- How Do I Handle the Error ModelArts.0212?
- How Do I Handle the Error ModelArts.4603 or ModelArts.4704?
- How Do I Handle the Error ModelArts.4204?
- Permissions
- Data Security and Privacy
- Regions and AZs
- General Consulting
- Videos
- Glossary
- More Documents
- General Reference
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What Are Regions and AZs?
Concept
A region and availability zone (AZ) identify the location of a data center. You can create resources in a specific region and AZ.
- 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 as universal regions and dedicated regions. A universal region provides universal cloud services for common tenants. A dedicated region provides specific services for specific tenants.
- An AZ contains one or more physical data centers. Each AZ has independent cooling, fire extinguishing, moisture-proof, and electricity facilities. 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.
Figure 1 shows the relationship between regions and AZs.
Huawei Cloud offers cloud services in a variety of regions around the world. You can select a region and AZ as needed.
How to Select a Region?
When selecting a region, consider the following factors:
- Location
You are advised to select a region close to you or your target users. This reduces the network latency and improves the access speed. However, Chinese mainland regions provide basically the same infrastructure, BGP network quality, as well as operations and configurations on resources. Therefore, if you or your target users are in the Chinese mainland, you do not need to consider the network latency differences when selecting a region.
The countries and regions outside the Chinese mainland, such as Bangkok and Hong Kong (China), provide services for users outside the Chinese mainland. If you or your target users are in the Chinese mainland, these regions are not recommended due to high access latency.
- If you or your target users are in Asia Pacific excepting the Chinese mainland, select the CN-Hong Kong, AP-Bangkok, or AP-Singapore region.
- If you or your target users are in Africa, select the AF-Johannesburg region.
- If you or your target users are in Europe, select the EU-Paris region.
- Relationship between cloud services
When using multiple cloud services, pay attention to the following restrictions:
- ECSs, RDS instances, and OBS buckets in different regions cannot communicate with each other through an internal network.
- ECSs in different regions cannot be bound to the same load balancer.
- Resource price
Resource prices may vary in different regions. For details, see Product Pricing Details.
How to Select an AZ?
When determining whether to deploy resources in the same AZ, consider your application's requirements on disaster recovery (DR) and network latency.
- For high DR capability, deploy resources in different AZs in the same region.
- For low network latency, deploy resources in the same AZ.
Regions and Endpoints
Before using an API to call resources, specify its region and endpoint. For more details, see Regions and Endpoints.
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