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- What's New
- Product Bulletin
- Service Overview
- Getting Started
-
User Guide
- Permissions Management
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Asynchronous Replication
- Managing a Replica Pair
- Managing a Protection Group
- Managing Protected Instances
- Managing DR Drills
- Managing Clients
- Synchronous Replication Management (for Installed Base Operations)
- Appendixes
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API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
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SDRS APIs
- Job
- API Version
- Active-Active Domain
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Protection Group
- Creating a Protection Group
- Querying Protection Groups
- Querying the Details of a Protection Group
- Deleting a Protection Group
- Changing the Name of a Protection Group
- Enabling Protection or Enabling Protection Again for a Protection Group
- Disabling Protection for a Protection Group
- Performing a Failover for a Protection Group
- Performing a Planned Failover for a Protection Group
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Protected Instance
- Creating a Protected Instance
- Deleting a Protected Instance
- Querying Protected Instances
- Querying Details About a Protected Instance
- Changing the Name of a Protected Instance
- Attaching a Replication Pair to a Protected Instance
- Detaching a Replication Pair from a Protected Instance
- Adding an NIC to a Protected Instance
- Deleting an NIC from a Protected Instance
- Modifying the Specifications of a Protected Instance
- Batch Creating Protected Instances
- Batch Deleting Protected Instances
- Replication Pair
- DR Drill
- Tag Management
- Task Center
- Tenant Quota Management
- Appendixes
- Change History
- SDK Reference
-
FAQs
- Common Problems
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Synchronous Replication (for Installed Base Operations)
- Do I Need to Manually Create DR Resources?
- What Can I Do When the EIP Cannot Be Pinged After I Perform a Switchover for a Protection Group Containing a SUSE Server?
- What Can I Do If the NIC Names of the DR Drill Server and Production Site Server Are Different?
- What Can I Do If hostname of the Production Site Server and DR Site Server Are Different After a Switchover or Failover?
- Why NICs of DR Site Servers Are Not Displayed After I Perform a Failover?
- What Are the Precautions If the Production Site Server Uses the Key Login Mode?
- What Should I Pay Attention to When Logging In to the Server After the First Time Ever I Executed a Switchover, Failover, or DR Drill?
- How Do I Use a Resource Package?
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Asynchronous Replication
- How Do I Handle the drm Process Start Failure?
- Failed to Install and Configure Disaster Recovery Gateway When Process drm Exists But Port 7443 Is Not Listened
- What Can I Do If the Name of a Production Site Server or the Host Name Reported by the Gateway Is Incorrect and Always Displayed as "localhost"?
- What Can I Do If the Disaster Recovery Site VM Is Not Started After a Switchover?
- How Do I Obtain the Installation Package on a Production Site Server from the Gateway?
- How Do I Enable or Disable an ECS Firewall and Add a Port Exception to the Firewall?
- Why Can't I Find the Disaster Recovery Gateway When Associating a Replica Pair with It?
- Why Is No Production Site Server Displayed When I Create Protected Instances?
- Videos
- Glossary
- Best Practices
- General Reference
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What Are RPO and RTO?
Recovery Point Objective (RPO): the maximum data loss amount tolerated by the system.
- SDRS asynchronous replication is based on the continuous asynchronous replication on the host side. Normally, the RPO is not zero (RPO < 1 minute).
This RPO can be achieved when the following conditions are met:
- Actual network bandwidth > Changed data volume per minute in peak hours/1 minute. Minimum bandwidth: 10 Mbit/s
- Network latency ≤ 100 ms; packet loss rate < 0.1%
- If the initial synchronization or differential data synchronization is not complete for a protected instance, this RPO is not guaranteed.
- During a planned switchover, ensure that the services and OS data in the cache has been flushed to disks.
Recovery Time Objective (RTO): the maximum service interruption duration tolerated by the system. It refers to the requirement for the recovery duration of an information system failure or service function failure caused by a disaster.
- In SDRS replication, RTO refers to the period from the time when you perform a planned or an unplanned failover to the time when ECSs are started on Huawei Cloud. Note that this period does not include the time that you spent on manual configuration, operations, network configuration, and script execution to try to start services. Normally, the RTO is not zero (RTO < 30 minutes).
This RTO can be achieved when the following conditions are met:
- A failover is performed after the initial synchronization is complete.
- Your account has sufficient resource quotas, including ECS, EVS, and VPC quotas.
- The RTO of SDRS asynchronous replication does not include the time that you spent on manual configuration and service configuration.
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