A system is employed to maintain persistent operation information for
implementation on persistent data. Bitmaps are created to track
outstanding persistent operations. Should a volume of information became
inaccessible, the bitmaps are evaluated to determine if outstanding
persistent operations exist and, if so, these outstanding operations are
performed before the volume is integrated into the logical memory space.
Additionally, operation-in-progress bitmaps are utilized to indicate that
persistent data within a volume is being modified.