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RAID 5 will give you the speed of n-1 drives, and the redundancy of 1 drive
RAID 6 will give you the speed of n-2 drives, and the redundancy of 2 drives
RAID 0 will give you the speed of n drives, and the redundancy of 0 drives
RAID 1 will give you the read speed of n drives the write speed of 1, and the redundancy of n-1 drive
as for controllers, 3ware is great, don’t forget about the bus speed you place it on, PCI cant handle much speed, so don’t expect to get much out of a normal PCI card, you need to either use PCI-e or PCI-X.
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