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Assume that the 4 data strips (i. data blocks) within a certain stripe on a RAID 5 system are designated B0, B1, B2 and B3.

Assume that the 4 data strips (i.e. data blocks) within a certain stripe on a RAID 5 system are designated B0, B1, B2 and B3. The corresponding parity block P for this stripe is computed as the cumulative XOR of the 4 data strips. Block B2 is to be updated  and its new contents is designated as B2'.  Write down 2 different expressions for the corresponding new parity block P0-3'.

a)    (5) (Using equation similar to P0-3 = bit0 ^ bit1 ^ bit2 ^ bit3      (^ denotes XOR operator))

  P0-3'= ______________

b)   (5) (Rearrange to express P0-3' in terms of Block 2, Block 2', P0-3.  Show your work.)

 P0-3'= ______________

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