## 3 SAP HANA System Replication: Configuration
After checking all the necessary prerequisites for configuring system replication, use the SAP HANA cockpit, the SAP HANA studio, or the hdbnsutil command line tool to configure system replication.
## How can I configure and disable system replication?
After checking all the necessary prerequisites, you can use the SAP HANA cockpit, the SAP HANA studio, or the hdbnsutil command line tool to configure system replication. This section describes how to configure and disable system replication. Generally, you have to perform the following steps:
- Perform an initial data backup or a storage snapshot.
- Enable the primary system for system replication.
- Establish a connection between the secondary and the primary systems.
- Initiate a full data replication by configuring system replication on the secondary and starting it. Thereafter, incremental data replication (only in delta\_datashipping operation mode) and continuous redo log replication (in all operation modes) start automatically.
- Disable system replication on the secondary system.
- Disable system replication on the primary system.
This chapter describes also how to initialize the secondary system, how to change the chosen operation or replication mode, or how to add and remove hosts. Furthermore, it shows you how to enable the full sync option in a synchronous system replication to reach a true RPO=0. This chapter also provides an overview of the configuration parameters, a command line reference, as well as information about SAP HANA tenant database systems in a system replication configuration, and the system replication setup for XS advanced.
## Where can I find more information?
The following SAP Notes are relevant for a full understanding of the basic concepts described in this chapter: SAP Notes
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|   SAP Note | Title                                                                                                                       |
|------------|-----------------------------------------------------------------------------------------------------------------------------|
|    2211663 | The license changes in an SAP HANAdatabase after the deregistration of the secondary site from a system replication setting |
|    2369981 | Required configuration steps for authentication with HANASystem Replica­ tion                                                |
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|   SAP Note | Title                                                                                                   |
|------------|---------------------------------------------------------------------------------------------------------|
|    2300936 | Host Auto-Failover &System Replication Setup with SAP HANAextended application services, advanced model |
|    2447994 | SAP HANADynamic Tiering Support for SAP HANASystem Replication                                          |
|     611361 | Hostnames of SAP servers                                                                                |
|    1945676 | Correct Usage of hdbnsutil - sr_unregister                                                              |
|    2300936 | Host Auto-Failover &System Replication Setup with SAP HANAextended application services, advanced model |
## Related Information
General Prerequisites for Configuring SAP HANA System Replication [page 35]
Configuring SAP HANA System Replication [page 38]
Initializing the Secondary [page 57]
Full Sync Option for SAP HANA System Replication [page 58]
Add and Remove Hosts in SAP HANA System Replication [page 60]
Changing the Operation Mode [page 61]
Changing the Replication Mode [page 62]
SAP HANA System Replication Configuration Parameters [page 62]
SAP HANA System Replication Command Line Reference [page 71]
Disabling SAP HANA System Replication [page 74]
SAP HANA System Replication Setup for XS Advanced Runtime [page 81]
SAP HANA System Replication with Tenant Databases [page 83]