This TruthValue controls whether this LUN should automatically consume all remaining available capacity in its disk group rather than being capped at a fixed size. Enabling this on a data LUN sharing a disk group with other LUNs can unexpectedly starve those sibling LUNs of room to grow later, so admins generally reserve it for the last LUN carved out of a given disk group. A value of true means this LUN will grow to consume whatever capacity is left in its disk group rather than a fixed size.