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This is only meaningful for raid1, 4, 5, 6, 10 or multipath arrays as only these have interesting state.
Normal operation just uses the 'Create', 'Assemble' and 'Monitor' commands - the rest come in handy when you're messing with your array; typically fixing it or changing it.
If your system has RAID support, you should have a file called /proc/mdstat. If you do not have that file, maybe your kernel does not have RAID support.
If you're sure your kernel has RAID support you may need to run run modprobe raid[RAID mode] to load raid support into your kernel.
Typically you do this in the init scripts after rebooting.
Monitor one or more md devices and act on any state changes.
Components can be explicitly given or can be searched for.