Device Mapper
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, 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.
Read more about Device Mapper: Applications, Device Mapper Applications
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