1.4. DM Multipath Components

Table 1.1, “DM Multipath Components”. describes the components of DM Multipath.

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Table 1.1. DM Multipath Components
Component	Description
`dm_multipath` kernel module	Reroutes I/O and supports failover for paths and path groups.
`mpathconf` utility	Configures and enables device mapper multipathing.
`multipath` command	Lists and configures multipath devices. Normally started with `/etc/rc.sysinit`, it can also be started by a `udev` program whenever a block device is added.
`multipathd` daemon	Monitors paths; as paths fail and come back, it may initiate path group switches. Allows interactive changes to multipath devices. The daemon must be restarted following any changes to the `/etc/multipath.conf` file.
`kpartx` command	Creates device mapper devices for the partitions on a device. It is necessary to use this command for DOS-based partitions with DM Multipath. The `kpartx` command is provided in its own package, but the `device-mapper-multipath` package depends on it.

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