The device mapper is a framework provided by the Linux kernel for mapping physical block devices onto higher-level virtual block devices. It forms the foundation of the logical volume manager (LVM), software RAIDs and dm-crypt disk encryption, and offers additional features such as file system snapshots.[1]
Device mapper works by passing data from a virtual block device, which is provided by the device mapper itself, to another block device. Data can be also modified in transition, which is performed, for example, in the case of device mapper providing disk encryption or simulation of unreliable hardware behavior.
This article focuses on the device mapper implementation in the Linux kernel, but the device mapper functionality is also available in both NetBSD and DragonFly BSD.[2][3]
^"Logical Volume Manager Administration, Appendix A. The Device Mapper". Red Hat. Retrieved 2013-09-29.
^"NetBSD Kernel Interfaces Manual: dm(4)". netbsd.gw.com. 2008-08-30. Archived from the original on 2014-07-19. Retrieved 2015-01-25.
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available for Windows and many Unix-like OSes Windows Server 2003 and later Devicemapper Juan Romero Pardines (2007/2008); David Gwynne (2006). "arcmsr — Areca...
with the devicemapper. Some distributions use an event-driven hotplug agent such as udev, which invokes helper programs as hardware devices, disk partitions...
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running a privileged operating system kernel, kernel extensions, and most device drivers. In contrast, user space is the memory area where application software...
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information individually, because each logical volume has its own devicemapper (dm) device. Disk-drive performance characteristics mpstat netstat sar (Unix)...
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