How to check mdadm raids while running?

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http://unix.stackexchange.com – I'm starting to get a collection of computers at home and to support them I have my "server" linux box running a raid array. Its currently mdadm raid1, going to raid5 once I have more drives (and then raid6 I'm hoping for). However I've heard various stories about data getting corrupted on one drive and you never noticing due to the other drive being used, up until the point when the first drive fails, and you find your second drive is also screwed (and 3rd, 4th, 5th drive). Obviously backups are important and I'm taking care of that also, however I know I've previously seen scripts which cl (HowTos)