If you choose this method, you perform the upgrade without using a script. This method requires a little more attention to detail on your part to ensure that the upgrade process goes smoothly.
You need snapshots so you can restore the Logging Node data, especially after performing software upgrades.
When snapshots are created, they need to be stored on a machine other than the Logging Node that stores the data. You define the location for the snapshot by editing the fstab file on each device in your Logging Node cluster.