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6.2.0 upgrade problems on RN104
Since upgrading my RN104 to 6.2.0 I've had similar problems to those listed by other users: - Unable to shutdown or reboot. Display shows appropriate message and power button LED flashes, but noth...
Another way to understand it is that there is an equation set up by the parity block and the associated data blocks. For each byte in the data blocks, DB1+DB2+DB3+PB1= 0. The "+" is really XOR, but it functions like normal addition (in a Galois field, which is the magical part. It also functions as subtraction in the same field, which is not intuitive at all). Anyway, if you know that one piece is missing (say DB3) you can solve the equation (DB3 = 0-DB1-DB2-DB3-PB1), and recover the lost data. With RAID-6 you have two different equations, and you can similarly solve them. Since there are two equations, you can solve for 2 unknowns.
The "magic" part is the modern algebra (the Galois field bit). Modern Error correcting mechanisms and loss recovery mechanisms all depend on modern algebra. But if you translate to ordinary algebra, you can understand the gist.
One constraint is that you need to know up front what piece of data is missing. In normal RAID that is determined by a read failure of one of the blocks.
The "magic" part is the modern algebra (the Galois field bit). Modern Error correcting mechanisms and loss recovery mechanisms all depend on modern algebra. But if you translate to ordinary algebra, you can understand the gist.
One constraint is that you need to know up front what piece of data is missing. In normal RAID that is determined by a read failure of one of the blocks.
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