I know about raid 0, 1 and 0+1, but I saw an ad for a server with 16 Raptors, that could do RAID 0, 1, 0+1, 3, 5, 10, 30 and 50. What are these and how crazy are they?
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I know about raid 0, 1 and 0+1, but I saw an ad for a server with 16 Raptors, that could do RAID 0, 1, 0+1, 3, 5, 10, 30 and 50. What are these and how crazy are they?
RAID 0: stripe across each driveQuote:
Originally posted by PCJ
I know about raid 0, 1 and 0+1, but I saw an ad for a server with 16 Raptors, that could do RAID 0, 1, 0+1, 3, 5, 10, 30 and 50. What are these and how crazy are they?
RAID 1: mirror each drive onto another
RAID 0+1: stripe across 1/2 the drives, mirror onto the other half
RAID 3: stripe across all drives but 1, store parity calcs on last drive for recovery
RAID 5: same as 3, but the parity is distributed among all drives
RAID 10: same as RAID 0+1
RAID 30: A form of RAID on RAID - use multiple RAID 3 arrays and stripe across each array
RAID 50: same as 30, but using RAID 5 arrays as the base unit
Pretty good breakdown, However I have to nitpick at something.Quote:
Originally posted by s1203372
RAID 0: stripe across each drive
RAID 1: mirror each drive onto another
RAID 0+1: stripe across 1/2 the drives, mirror onto the other half
RAID 3: stripe across all drives but 1, store parity calcs on last drive for recovery
RAID 5: same as 3, but the parity is distributed among all drives
RAID 10: same as RAID 0+1
RAID 30: A form of RAID on RAID - use multiple RAID 3 arrays and stripe across each array
RAID 50: same as 30, but using RAID 5 arrays as the base unit
Raid 10 is not quite the same as 0+1. The order of the numbers is important.
Raid 0+1 means stripe(0) first, then mirror(1) the stripe. You end up with two stripes that are mirrors of each other. If you lose 1 disk you lose that entire stripe. Lose a second disk in the mirror and you've lost everything.
Raid 10 means mirror(1) first, then stripe(0). This method provides better data redundancy as you can lose multiple drives without losing any of your data. The only way you lose your data if you lose both stripes of a single mirrored set. Hope that makes sense, it's kind of difficult to explain without drawing a diagram.
Wow, I just learned quite a bit.