Use device parity protection or mirrored protection on the system disk pool to reduce the chance that the system disk pool will lose all data. If the system disk pool is lost, addressability to objects in every user disk pool will also be lost.
You can restore the addressability by restoring the entire system or by running the Reclaim Storage (RCLSTG) command. However, the RCLSTG command cannot recover object ownership. After you run the command, the QDFTOWN user profile owns all objects. You can use the Reclaim Document Library Object (RCLDLO) command procedure to recover ownership of document library objects.