Quote:
Originally Posted by SebC
I think that's wrong. RAID 1 is you lose all but one drive. RAID 5 is you lose one drive. RAID 6 is you lose two drives.
RAID 1 works as long as one drive is operational. RAID 5 requires all but one drive to be operational. RAID 6 requires all but two drives to be operational.
Typically, RAID 1 is only used on 2 drive arrays, so you lose 50%.
If you're going with 4 drives for storage, I'd use RAID 5. 75% of capacity is available, you don't need extra speed and everything's safe from disk failure.
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I used to agree with you, but I am pretty sure we bought one of the enclosures I linked in my previous post last year at work and it formatted with an extra 33% than what i expected (ie 66% of the total of both drives).
I will check when I go in today, and would be very happy if you were correct because it really bugs me that I think it is otherwise.
edit: Yeah, its not the RAID1 drive that had the extra capacity, so ignore my 33% thing.