You can create a user basic pool by grouping a set of disk units together and assigning that group to a disk pool. Basic disk pools can contain libraries, documents, and certain types of objects. Data in a basic user pool is always accessible whenever the server is up and running. You can configure basic disk pools with numbers 2 through 32. When storage for a basic disk pool is exhausted, the data can overflow into the system disk pool. This is different from an independent disk pool, which does not allow data to overflow into the system disk pool.
After you have disk pools configured, you should protect them by using Work with mirrored protection or Device parity protection. See Disk protection for more information.