Enable Failover Support for an RSSD Connection

Use SAP Failover to configure two version 12.0 or later SAP ASEs as companions. If the primary companion fails, the devices, databases, and connections of the primary companion can be taken over by the secondary companion.

For more detailed information about how SAP Failover works in SAP ASE, see Using SAP Failover in a High Availability System which is part of the SAP ASE documentation set.

To enable Failover support for an RSSD connection, use either of the following methods:

Use rs_init when you install a new SAP Replication Server.

For instructions, see Configure Replication Server and Add Databases Using rs_init in the configuration guide for your platform.
Edit the SAP Replication Server configuration file after you have installed the SAP Replication Server.
1. Use a text editor to open the SAP Replication Server configuration file. The default file name is the SAP Replication Server name with a “.cfg” extension.
  
  The configuration file contains one line per entry.
2. Find the line “RSSD_ha_failover=no” and change it to:
```
RSSD_ha_failover=yes
```
3. To disable Failover support for an RSSD connection, change the “RSSD_ha_failover=yes” to:
```
RSSD_ha_failover=no
```
  These changes take affect immediately; that is, you do not have to restart SAP Replication Server to enable Failover support.

If you cannot recover the most recent database state of the RSSD, see Recover from RSSD failure in the Administration Guide Volume 2.

Note: It is not possible to migrate an RSSD database across platforms using commands such as, cross-platform dump and load, or bcp. To migrate, you must rebuild the replication system on the new platform.

For instructions on how to enable Failover support for non-RSSD SAP Replication Server connections to SAP ASE, see Configure the Replication System to Support SAP Failover in the Administration Guide Volume 2.