9. DM-Multipath Components 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. kpartx command 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. multipathd daemon 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. multipath command Reroutes I/O and supports failover for paths and path groups. dm-multipath kernel module Description Component
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17. Useful multipath Command Options Remove all multipath devices multipath -F Remove the named multipath device multipath -f device Display the current multipath configuration gathered from sysfs, the device mapper, and all other available components on the system multipath -ll Display the current multipath configuration gathered from sysfs and the device mapper multipath -l Description Command
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