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Using "Sata Controller" to add extra ports with mdadm software raid to create a raid 5 array

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http://askubuntu.com – Here is the set up.... Ubuntu 12 LTS, Plex.. ect.I am looking on setting up a raid 5 using 4 2tb disks to create 6tb of space with a fail safe. One thing I have had a thought about which I am unsure thus was wondering if the gurus here had an answer too, is the use of a sata controller with mdadm software raid.... Would buying a 4 port PCI sata 3 controller to add more sata ports to the system work with mdadm to create a raid 5 array? This is opposed to buying a 4 port fakeraid controller with raid 5 in its little bios. All the best guys! (HowTos)