Configuration: Device Mapper Multipath for Linux 21914Configuration: Device MapperMultipath for LinuxOverviewThe MD3600f Series storage array uses a Linux operating system softwareframework, known as Device Mapper (DM), to enable multipath capabilitieson Linux Host Servers. The DM multipath functionality is provided by acombination of drivers and utilities. This chapter describes how to use thoseutilities to complete the process of enabling an MD3600f Series storage arrayon a Linux system.NOTE: The Device Mapper technology replaces an earlier, proprietary technology,known as MPP. MPP was used to enable multipathing for a previous MDgeneration, the MD3000 Series of storage arrays.NOTE: The required Device Mapper software components are installed on a Linuxhost server by running the MD3600f Series Resource media installation program onthe server, and selecting either the Full or Host install option. For detailedinstallation procedures, see the Dell PowerVault MD3600f and MD3620f storagearrays Deployment Guide at support.dell.com/manuals.Benefits of using DM Multipath include:• Detects path failure and re-routes I/O to other available paths• Revalidates failed paths after path restoration• Utilizes multiple available paths to maximize performance• Reconfigures path usage based on path states and error conditions• Unifies multiple device nodes into a single logical multipath device node• Indentifies a new multipathed LU and automatically configures a newmultipath node• Provides device name persistency for DM devices under /dev/mapper/
