Orion Platform: The common backend platform used by the SolarWinds Orion suite of products, including NPM, SAM, SRM, and more. The platform provides the backbone for navigation, settings, and common features like alerts and reports. It also provides a consistent look-and-feel across products, giving you a "single pane of glass" view of all your Orion monitoring tools.
SolarWinds Platform Web Console: The web interface you see when you log in to Orion that is used to view, configure, and manage all of your monitored objects.
Orion Application Server: A Windows server that runs the SolarWinds Platform Web Console and collects data from monitored objects. Also called the Orion Main Poller.
Orion Database Server: A Windows SQL server that should be hosted on a dedicated server in a production environment, separately from the Orion Application Server. It stores Orion configuration data and all collected performance and syslog data.
For a general introduction to storage basics, understanding storage performance and capacity, forecasting storage usage and storage best practices, download the Essential Enterprise Storage Concepts ebook.