3. Suppose a RAID level-4 system has 4 data disks and a parity disk. The data di

Question

3.      Suppose a RAID level-4 system has 4 data disks and a parity disk.  The data disks are labeled D0, D1, D2, and D 3 and suppose D1 fails.  Reading the first blocks from the surviving disks, we find that D0 contains the value B2h, D2 contains 1Eh, D3 contains 59h and the parity disk contains 33h.  If a block is one byte, reconstruct the value that was contained in the first block for D1. 3.      Suppose a RAID level-4 system has 4 data disks and a parity disk.  The data disks are labeled D0, D1, D2, and D 3 and suppose D1 fails.  Reading the first blocks from the surviving disks, we find that D0 contains the value B2h, D2 contains 1Eh, D3 contains 59h and the parity disk contains 33h.  If a block is one byte, reconstruct the value that was contained in the first block for D1.

Explanation / Answer

D0 XOR D1 XOR D2 XOR D3 = Parity

Parity = 33h = 00110011

D0 = B2h = 10110010

D2 = 1Eh = 00011110

D3 = 59h = 01011001

D2 = Parity XOR D0 XOR D2 XOR D3

D1 = 11000110 = C6h

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