Understanding Device-mapper in Linux 2.6 Kernel
(Doc ID 456239.1)
Last updated on APRIL 21, 2020
Linux OS - Version 2.6 to 2.6 Oracle Cloud Infrastructure - Version N/A and later Linux x86 Linux x86-64
Linux Kernel - Version: 2.6 to 2.6
***Checked for relevance on 28-Jul-2011***
***Checked for relevance on 21-Mar-2013***
Device-mapper is a very important component of Linux 2.6 kernel. It is used for many critical storage related applications, such as LVM2, Linux native multipath tool device-mapper-multipath, device-mapper software RAID, etc. A solid understanding of device-mapper helps system administrators to investigate various kinds of issues with these applications.
This bulletin is to explain the goal of device-mapper driver and it will explore the internal mechanism as well as some details of implementation. Finally there will be an example of leveraging dmsetup.
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