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Originally Posted by blue68f100
How much capacity difference between raid 1 and a 3 disk Raid 5 ?????
You can always put the drives in a old PC and run FreeNAS in raid 5. The only problem is it's still beta, with limited support.
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RAID 1 = 1/2 capacity
RAID 5 = 2/3 capacity
i.e.
2 x 250 GB drives in RAID 1 (Mirrored) will give you 250 GB.
3 x 250 GB drives in either RAID 3 (2 drives stripped and 3rd drive as parity) or RAID 5 (3 drives stripped with 1/3 of each drive being used for parity) will give you 500 GB.
3 x 250 GB with 1 x 250 GB hot spare in RAID 5 (3 drives striped with 1/3 of each drive for parity and 1 drive as a spare) will give 500 GB.
4 x 250 GB drives in RAID 5 (4 drives striped with 1/3 of each drive used for parity) will give you approximately 670 to 700 GB.
With RAID 5, you actualy get a little more than 2/3, but that is a close approximation for a RAID 5 setup in most cases. Wrong?
As for FreeNAS and RAID 5, I would not trust it at all (yet). I was reading on their forum that they found a bug with it (more than a bug if you ask me). It works in RAID 5 okay, but when a drive fails and you replace that drive, the RAID 5 does not rebuild without crashing. Kinds of defeats the purpose of the RAID 5 if you ask me.