Hubs

A hub is a service that logically groups and monitors its associated devices. You will generally have one hub per machine, but you can use multiple hubs depending on your workload. For example, if you have many devices to monitor, a single disk might not be able to handle the load. In that case, you can split the load across multiple hubs. Each hub can have a separate "Storage Root," allowing you to use a different disk for each hub.