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Device-mapper (hereafter, dm) is one of the best collection of device drivers that I have ever worked with. It brings high availability, flexibility and more to the Linux 2.6 kernel. Device-mapper is a Linux 2.6 kernel infrastructure that provides a generic way to create virtual layers of a block device while supporting stripping, mirroring, snapshots, concatenation, multipathing, etc. While many modules are built on top of device-mapper, the focus of this article is on multipath-tools.
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