.SH DESCRIPTION
dmsetup manages logical devices that use the device-mapper driver.
Devices are created by loading a table that specifies a target for
-each sector in the logical device.
+each sector (512 bytes) in the logical device.
The first argument to dmsetup is a command.
The second argument is the logical device name or uuid.
logical_start_sector num_sectors target_type target_args
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There are currently three simple target types available together
with more complex optional ones that implement snapshots and mirrors.