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1. Device Mapper Multipathing‌

Device mapper multipathing (DM-Multipath) allows you to configure multiple I/O paths between server nodes and storage arrays into a single device. These I/O paths are physical SAN connections that can include separate cables, switches, and controllers. Multipathing aggregates the I/O paths, creating a new device that consists of the aggregated paths. This chapter provides a summary of the features of DM-Multipath that are new for the initial release of Ubuntu Server 12.04. Following that, this chapter provides a high-level overview of DM Multipath and its components, as well as an overview of DM-Multipath setup.


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