In order to safely shutdown the Nodes, you can use the Web Admin interface available in your Cluster
From the tab Nodes that can be found left on your WebAdmin interface,
You can select the Node(s) you wish to power down as shown below:
Then from the action button on the right choose the option "Shutdown":
After a few minutes, your node(s) will be powered off.
In order to turn them back on, we advise turning on Node 1 in the first place and the remaining ones afterwards with an interval of 20 seconds. Please keep in consideration that depending on the amount of data you store on your cluster, it may become available after a period up to 30 to 45 minutes. Usually, it takes less than this.
If have any issues with this procedure or if you need further information about it, please do not hesitate in getting back to us using the support portal.