Solution Design

Deployment Plan

To deploy the system on HUAWEI CLOUD, keep the application architecture unchanged and replace third-party cloud services with HUAWEI CLOUD services.

For details about the deployment solution design, refer to section Deployment Plan.

Networking Plan

The system networking on HUAWEI CLOUD is the same as that of the source end. The system connects to a third-party cloud through EIP and VPN or Direct Connect.

For details, see Networking Plan.

Security Design

For details, see Security Design. Find more information in the SAP Security White Paper.
For details about permission management, see Service Account System Design.

Migration Plan

Table 1 lists the recommended migration solutions.

**Table 1** Migration solutions
Object	Solution	Description
Application servers	Server Migration Service NOTE: The source server must access HUAWEI CLOUD SMS. Bind a public IP address to the source server.	SMS supports online and incremental migration. You can migrate SAP application servers while the applications are running, and synchronize incremental data several times. Data transmission time = Actual data volume/Actual network bandwidth Table 2 lists the estimated time for transmitting 1 TB data. Estimate the time required for transmitting data based on the actual data volume. If the data cannot be transmitted within the estimated time, increase the network bandwidth.
Database	You can migrate a non-production system database after stop the database service using SMS. You can use the database backup and restoration function or other native database tools to migration the production system database.	When using SMS, you need to stop the database servcie before the migration to ensure data consistency. The service interruption duration of using native database tool is shorter than that of using the SMS. For details about the estimated interruption duration, see section Table 1.

**Table 2** Theoretical time for transmitting 1 TB data
Network Bandwidth	2 Mbit/s	10 Mbit/s	50 Mbit/s	100 Mbit/s
Theoretical time (80% network utilization rate) NOTE: Transmission time (days) = [Total capacity (KB)]/[Bandwidth (Mbit/s) x 125 x Network utilization rate x 60 (seconds) x 60 (minutes) x 24 (hours)]	106 days	13 days	60 hours	30 hours

Service Switchover Plan

The owner of the service switchover plan is the migration implementor. This section provides an example of the service switchover plan.

**Table 3** Switchover plan example
Migration Solution	Switchover Plan	Impact
The application servers are redeployed on or migrated to HUAWEI CLOUD by importing images. The database is restored using backup data.	Redeploy and commission the application servers on HUAWEI CLOUD. Back up the entire source database server and upload full backups to the target system to restore data to the target database. Stop the source database, upload the incremental or differential data and required log files to HUAWEI CLOUD, and restore the backup data to the target database.	The service interruption duration = the incremental backup duration + the incremental backup transmission duration + the incremental data restoration duration
Use SMS to migrate the application servers, and the database replication function to synchronize database.	After the application servers are migrated to HUAWEI CLOUD using SMS, use incremental replication to synchronize the servers. Configure synchronous replication from the on-premises database to the cloud database. Stop the services on the source end and perform the service takeover on the cloud database.	Stop source end services only after the last incremental synchronization is performed using SMS. After the cloud database takes over the services, the service switchover is complete. The service interruption duration is the database switchover duration.