i am unable to load mappingtable by using dmsetup and unable to create vitualdevice
 

sir i am trying to make low level volume managment by using dmsetup.
but am not able to create the virtual device by using the command "create".please explain me in detail how to map to devices into a one logical device by using dmsetup.please explain me how to write the table for the same and how to use all this in the dmsetup create command.

waiting for reply