Enabling Coordinator Mirroring

To add a standby coordinator to an existing system
To check the status of the coordinator mirroring process (optional)

You can configure a new LightDB-A Database system with a standby coordinator using gpinitsystem or enable it later using gpinitstandby. This topic assumes you are adding a standby coordinator to an existing system that was initialized without one.

For information about the utilities gpinitsystem and gpinitstandby, see the LightDB-A Database Utility Guide.

To add a standby coordinator to an existing system

Ensure the standby coordinator host is installed and configured: gpadmin system user created, LightDB-A Database binaries installed, environment variables set, SSH keys exchanged, and that the data directories and tablespace directories, if needed, are created.
Run the gpinitstandby utility on the currently active primary coordinator host to add a standby coordinator host to your LightDB-A Database system. For example:
```
$ gpinitstandby -s scdw
```
Where -s specifies the standby coordinator host name.

To switch operations to a standby coordinator, see Recovering a Failed Coordinator.

To check the status of the coordinator mirroring process (optional)

You can run the gpstate utility with the -f option to display details of the standby coordinator host.

$ gpstate -f

The standby coordinator status should be passive, and the WAL sender state should be streaming.

For information about the gpstate utility, see the LightDB-A Database Utility Guide.

Parent topic: Enabling Mirroring in LightDB-A Database