Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux

1.4. DM Multipath Components

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

Table 1.1. DM Multipath Components

ComponentDescription
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.