What Is Single-Active/Dual-Active Disaster Recovery?
With the rapid development of information technologies, data and information play an increasingly important role in modern enterprises. Loss and damage of data will cause inestimable losses to enterprises. How to defend against large-scale disasters has drawn increasing attention. Currently, remote disaster recovery (DR) is the only feasible solution. The backup and restoration of key data is an important part of the routine operation and maintenance of the system.
The dual-AZ, HA instances of Huawei Cloud RDS can meet the requirements of intra-city disaster recovery. DRS provides cross-region and cross-cloud DR capabilities, including single-active DR and dual-active DR.
Currently, Huawei Cloud RDS for MySQL instances support the single-active or dual-active DR. If both sides are Huawei Cloud RDS for MySQL instances, cross-region DR can be performed.
Single-Active DR
Dual-Active DR
- The dual-active DR architecture has high requirements on the environment. Before deploying the dual-active DR solution, view Before You Start.
- The dual-active DR deployment poses strict requirements on the procedure. Perform the following steps to ensure that the dual-active DR task can be successfully deployed.
- Create a DR task. For details, see Create a DR Task. After the creation is complete, two subtasks are generated, that is, the forward DR task and reverse DR task. In this case, the reverse DR task is in the configuration state.
- When the forward DR task is in the DR state (the reverse task is displayed in the Operation column), configure and start the reverse task.
On the Disaster Recovery Management page, select the backward DR task and click Edit in the Operation column. The Create Disaster Recovery Task page is displayed. Continue to create the backward task.
You are advised to perform the verification on the active database 2 and start the backward task after the expected result is met.Figure 3 Forward and backward DR task
Product Consulting FAQs
- What Are Regions and AZs?
- What Is DRS?
- Can DRS Migrate RDS Primary/Standby Instances?
- What Constraints Does DRS Have for a Source Database?
- What Requirements Does DRS Have for a Destination Database?
- Does DRS Use Concurrency?
- Dose DRS Use Data Compression?
- Does DRS Support Migration Between the Public Cloud and the Dedicated Cloud?
- What Is the Quota?
- Does DRS Support Migration from DB2 for LUW to PostgreSQL?
- Can Microsoft SQL Server Database Synchronize Data with Local Databases in Real Time?
- Does DRS Support Data Replication in a Specified Time Period?
- Does DRS Support Resumable Uploads?
- What Is Single-Active/Dual-Active Disaster Recovery?
- What Are the Differences Between Real-Time Migration, Real-Time DR, and Real-Time Synchronization?
- How Do I Solve the Table Bloat Issue During MySQL Migration?
- How Does DRS Affect the Source and Destination Databases?
- Do I Need to Stop Services Running on the Source Database?
- What Is an SMN Topic?
- What Are the Differences Between Single-AZ and Dual-AZ DRS Tasks?
- Can DRS Migrates Table Structures Only?
- How Do I Migrate Accounts in MySQL Migration, Synchronization, and DR Tasks and Can I Change Passwords?
- What Factors Affect the DRS Task Speed and How Do I Estimate the Time Required?
- Can I Modify Objects in a DRS Task?
- Does DRS Support Data Synchronization Between Different Databases of the Same DB Instance?
- Which Operations on the Source or Destination Database Affect the DRS Task Status?
- What Are Differences Between Data Subscription and Synchronization from MySQL to Kafka?
- Why Cannot Standby Read Replicas on Some Other Clouds Be Used as the Source Database?
- Does DRS Support Migration of Users Encrypted by the Caching_sha2_password Plugin?
- Why Is the Database Disk Usage Inconsistent Before and After Data Migration?
- What Is the Serialization Mode of Messages Sent by DRS to Kafka?
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