High Quality Content by WIKIPEDIA articles! In the Linux kernel, the device-mapper serves as a generic framework to map one block device onto another. It forms the foundation of LVM2 and EVMS, software RAIDs, dm-crypt disk encryption, and offers additional features such as file-system snapshots. Device-mapper works by processing data passed in from a virtual block device, that it itself provides, and then passing the resultant data on to another block device. Applications (like LVM2 and EVMS) that need to create new mapped devices talk to the device-mapper via the libdevmapper.so shared library, which in turn issues ioctls to the /dev/mapper/control device node. Developers can also access device-mapper from shell scripts via the dmsetup tool.

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