|dm_multipath kernel module
||Reroutes I/O and supports failover for paths and path groups.
||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 or it can be run by the initramfs file system.
||Monitors paths; as paths fail and come back, it may initiate path group switches. Provides for interactive changes to multipath devices. This daemon must be restarted for any changes to the
/etc/multipath.conf file to take effect.
||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 is provided in its own package, but the multipath-tools package depends on it.