mdadm: A tool for managing Linux Software RAID arrays.
mdadm: 
mdadm: It can create, assemble, report on, and monitor arrays.
mdadm: 
mdadm: It can also move spares between raid arrays when needed.
mdadm: 
mdadm: It can be found at http://neilb.web.cse.unsw.edu.au/source/mdadm/ or http://www.kernel.org/pub/linux/utils/raid/mdadm/ or any of the kernel.org mirrors.
mdadm: 
mdadm: FAQ and other documentation can be found at http://linux-raid.osdl.org/index.php/Main_Page
mdadm: