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Growing a raid 5 array

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http://www.linuxquestions.org – Hello, I have 3 x 1.5TB drives is a raid 5 array, at the moment the storage capacity is enough, but soon I will need to expand this. I have a spare 1.5TB drive that I am thinking about adding to the array. So far I have read mixed articles/posts, some saying it can be done, others say it can't. From what I understand I use: mdadm --add /dev/md0 /dev/sde1 mdadm --grow /dev/md0 --raid-devices=4 But is it really that simple? Does the existing data really stay intact? How dangerous is this to the data? I know I sho (HowTos)