1.4. DM-Multipath Components
1.4. DM-Multipath Components Table 1.1, "DM-Multipath Components" . describes the components of DM-Multipath. 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 up with /etc/rc.sysinit , it can also be started up 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. Provides for interactive changes to multipath devices. This must be restarted for 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-MP. The kpartx is provided in its own package, but the device-mapper-multipath package depends on it.