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RAID Recovery Course - Parity Analysis Test
What is calculated in parity analysis?
percent of zero rows in disk set
percent of parity matches in disk set
percent of parity matches in disk pairs
Parity test for a Promise RAID6 gives:
0% parity in full disk set and 0% parity in all combinations with one disk excluded
0% parity in full disk set and 100% parity in all combinations with one disk excluded
100% parity in full disk set and 0% parity in all combinations with one disk excluded
Look at the picture on the right and guess a RAID level
3-disk RAID 5 with a hotspare
4-disk RAID 5 with one disk missing
full 4-disk Promise RAID6 or full 4-disk RAID5
Choose the correct statement
A XOR A < 0
A XOR A = 0
A XOR A > 0
Given that P is a parity block calculated over A and B data blocks
A XOR B XOR P = 0
A XOR B XOR P = 1
Which parity function is usually used in a RAID5?
Reed-Solomon
Lempel, Ziv, Welch
Huffman
XOR
Look at the picture on the right and guess the possible RAID level
RAID 5 with a blank disk
RAID 5 with a missing disk
Full RAID5
Choose the property of XOR function due to which "mirrors are always even"
A XOR B = B XOR A
A XOR A = 0
A XOR 0 = A
Look at the picture on the right and guess the possible RAID level
RAID 6 with a missing disk
RAID 5 with a missing disk
Full RAID6
Full RAID 5 with a hotspare
Parity is a special function calculated over data blocks
true
false
Next lesson - Entropy analysis