$1$ RAID

We discussed various RAID levels $(0,1,4,$ and $5).$ RAID$5$ uses parity striped

across all the disks in the array. There are other RAID levels, though. In

particular, I recently had to learn about RAID$6...$ so you get to learn something

about it$,$ too.

In RAID$4,$ we added a disk to the array to contain the parity of the other

N$-1$ disks in the array. The performance wasn$$t good for writes because EVERY

write affected the poor parity disk. Solution: RAID$5$ which stripes the parity

across all of the disks, effectively spreading the performance penalty across all

of the disks.

In RAID$6,$ one more drive is added which contains an additional parity.

You goal: fill out Table $38\mathrm{.}8$ in the text for RAID$6.$ How many failures can be

tolerated? What is the sequential read performance? etc.

I have attached a image of the $38\mathrm{.}8$ figure to fill in for raid $6.$