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1.4. DM Multipath Components

表 1.1 “DM Multipath Components”. describes the components of DM Multipath.

表 1.1. DM Multipath Components

组件	描述
dm_multipath kernel module	为路径和路径组群重新指定 I/O 并支持出错冗余。
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.