Set up software RAID1 on a running system
I have a nas / server running Slackware64-13.37 with two raid arrays, one with 3x500GB disks and the other with 2x2TB disks. I also have 1x80GB hdd which contains the os.
I found a spare 250GB hdd from my closet and want to set up raid1 array from os hdd and that spare drive.
I know that I can't make use of the extra 170GB of space but I don't care as long as I have working installation on the other disk if that 80GB hdd breaks.
How can I set up that kind of raid1 without losing any data?
My boot loader is lilo.