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- How does parity work on a RAID-5 array? 5 answers
In a raid 5 setup, you get 4 TB of usable space out of 3 x 2 TB disks. How is that possible?
Simple minded as I am, I would think that you need 4TB to store your things, and use the remaining 2TB for recovery. But how can I recover 4TB out of only 2TB? If 1kb is gone, I only have 0.5kb to recover from. And if that is sufficient, why not use 0.5kb for storage right from the start.
I know this is a naive question. But what is the answer?