Search notes:

/dev/mdN

md stands for meta disk (but I've also seen: multiple devices).
Linux supports the following md devices:

See also

Besides /dev/mdN, there is also /dev/md/N.
/proc/mdstat
/dev
/sys/block/mdX/…
The executable mdadm and /etc/mdadm/mdadm.conf
The three scripts found under /usr/share/mdadm
raidtools

Index