9.3 Upgrading Analytics Server in a High Availability Setup

You must first upgrade the passive node in the cluster, then upgrade the active node.

Enable the maintenance mode on the cluster.
```
crm configure property maintenance-mode=true
```
Maintenance mode helps you to avoid any disturbance to the running cluster resources when you update Analytics Server. You can run this command from any cluster node.
Verify if the maintenance mode is active.
```
crm status
```
The cluster resources should appear in the unmanaged state.
Upgrade the passive cluster node:
1. Stop the cluster stack.
```
rcopenais stop
```
  Stopping the cluster stack ensures that the cluster resources remain accessible and avoids fencing of nodes.
2. Upgrade Analytics Server on the passive node. For information about upgrading Analytics server, refer Upgrading Analytics Server.
3. After the upgrade is complete, start the cluster stack.
```
rcopenais start
```
Upgrade the active cluster node:
1. Stop the cluster stack.
```
rcopenais stop
```
  Stopping the cluster stack ensures that the cluster resources remain accessible and avoids fencing of nodes.
2. Upgrade Analytics Server on the active node. For information about upgrading Analytics server, refer Upgrading Analytics Server.
3. After the upgrade is complete, start the cluster stack.
```
rcopenais start
```
4. Run the csync2 -x -v command to synchronize any changes in the configuration files.
Disable the maintenance mode on the cluster.
```
crm configure property maintenance-mode=false
```
You can run this command from any cluster node.
Verify whether the maintenance mode is inactive.
```
crm status
```
The cluster resources should appear in the Started state.