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