Where can I which device these device names are?
I actually have another local raid5 volume
so sdb i think might be the local raid5 volume on a perc5 with 6x1tb drives
and sdc is the 2xmd1000 30x1tb drives raid6

i have made some changes though since my last post. i now have each md1000 with raid5 15x1tb, instead of one 30x1tb raid6