device-mapper: device-mapper (device-mapper for logical volume management) device-mapper: device-mapper: The goal of device-mapper is to support volume management. The device-mapper: driver enables the definition of new block devices composed of device-mapper: ranges of sectors of existing devices. This can be used to define device-mapper: disk partitions or logical volumes. device-mapper: device-mapper: device-mapper is required by LVM2, the Logical Volume Manager. device-mapper: device-mapper: device-mapper: