A Storage Pool is a container of one (1) or more Disks (see Disks). Volumes (see About Volumes) must be assigned to a single Storage Pool that they will use for all of their Data Storage. As your storage needs grow, you may want to add new NAS systems or Hard Disks. You can add these to an existing Storage Pool allowing some flexibility in your growth.
All Disk Safes belong to a Host. A Host is assigned to a Volume and Volumes are assigned to Storage Pools. When a new Disk Safe is created, it is assigned an available Disk from its assigned Storage Pool. If there is more than one Disk in the Storage Pool, the Disk with the lowest underlying Disk usage is selected.
A Disk Safe requires storage for file lists, encryption keys, and the Disk Safe Index (.idx file). This storage does not typically consume the bulk of the Data Storage in a Disk Safe. Disk Safes use Data Files (.data) to store the actual Hard Drive sectors. A Data File is limited in size to approximately 500 GB. When a Data File reaches it maximum size, a new Data File is created and a new Disk from the Storage Pool is selected to store that Data File.
Read more information in the following documents: