how to disassemble / destroy a raid
how can i disassemble a raid 5 partition?
basically i have 3 x320GB hd's at the moment in raid5.. thats sdb1, sdc1 and sdd1..
i am just in my initial steps with raid.. and i managed to get a hold of a 4th identical drive..
so im reading that i could add it with mdadm --grow..
but since i haven't written anything on the drives yet.. i could just destroy this raid.. and make a completely fresh one..
an additional reason is that having not done that before in the current raid i did not use the --force option thus mdadm decided to create a raid 5 (out of my 3 drives) one of which is labeled 'missing' and used as a spare instead...
that results in having only 2 active drives in raid 5 which in turn means i only get 1/3 of the space i have. ie df returns to me 320GB for /dev/md0 node instead of 640GB that it should (2/3 x total size).
so how can i go about destroying the raid table or whatever else so that i can start the raid again from scratch?
thank you for your help