Preparation: Set Up a Disaster Recovery Network on the Cloud

Scenarios

A VPC provides an isolated virtual network for your disaster recovery site servers. You can configure and manage the network as required.

In asynchronous replication, data on the to-be-protected servers at the on-premises data center is continuously replicated to the cloud disaster recovery site through a network. When an outage occurs at your local data center, you can switch services to the disaster recovery site servers on the cloud to ensure service continuity.

Factors to consider when creating a network on the cloud:

Scope of disaster recovery
Select a region considering the following factors: physical distance between two sites, network performance, and costs. For example, keeping at least 100-km physical distance between the production site and disaster recovery site, less than 100-ms network latency, and cost-effective network (Direct Connect not used due to a tight budget).
Network between the on-premises data center and the VPC on Huawei Cloud
- Public network: suitable for scenarios that the data volume is stable and access to the cloud resources from the on-premises data center is infrequent.
- VPN: suitable for scenarios that the data volume is stable and access to the Huawei Cloud resources from the on-premises data center is frequent. If some of your services are deployed on Huawei Cloud, and the on-premises data center services interact with the cloud services through a VPN, you can use this VPN for asynchronous replication.
- Direct Connect: suitable for complex scenarios with a large volume of data. Make the plan based on the data change volume of your services.
VPC CIDR block
Provide IP addresses for the servers created during failovers or disaster recovery drills. To keep the IP addresses unchanged, set the VPC CIDR block to the same as the network segments of production site servers in the local data center. In this case, server IP addresses will remain the same during failovers or drills, without any additional configurations.