> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/analytics/mariadb-columnstore/management/node-maintenance-for-mariadb-enterprise-columnstore/switchover-primary-node.md).

# Switchover of the Primary Node

To switchover to a new primary node with ColumnStore, perform the following procedure.

## Performing Switchover in MaxScale

The primary node can be switched in MaxScale using [MaxScale's REST API](/docs/maxscale/reference/maxscale-rest-api.md):

* Use [MaxCtrl](/docs/maxscale/maxscale-management/administrative-tools-for-mariadb-maxscale-maxctrl.md) or another supported REST client.
* Call a module command using the `call command` command.
* As the first argument, provide the name for the module, which is [mariadbmon](/docs/maxscale/reference/maxscale-monitors/mariadb-monitor.md).
* As the second argument, provide the module command, which is `switchover` .
* As the third argument, provide the name of the monitor.

For example:

```bash
maxctrl call command \
   mariadbmon \
   switchover \
   mcs_monitor
```

With the above syntax, MaxScale will choose the most up-to-date replica to be the new primary.

If you want to manually select a new primary, provide the server name of the new primary as the fourth argument:

```bash
maxctrl call command \
   mariadbmon \
   switchover \
   mcs_monitor \
   mcs2
```

## Checking the Replication Status with MaxScale

MaxScale is capable of checking the status of [MariaDB Replication](/docs/server/ha-and-performance/standard-replication.md) using [MaxScale's REST API](/docs/maxscale/reference/maxscale-rest-api.md):

* List the servers using the `list servers` command, like this:

```bash
maxctrl list servers
```

If switchover was properly performed, the `State` column of the new primary shows `Master, Running`.

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