RAID Recovery Course - Parity Analysis Test

Choose the property of XOR function due to which "you do not need to know the parity location when reconstructing a missing disk"

A XOR B = B XOR A
A XOR 0 = A
A XOR A = 0

Choose the correct statement

A XOR 0 = 1
A XOR 0 = 0
A XOR 0 = A

Which parity function is usually used in a RAID5?

Huffman
Lempel, Ziv, Welch
XOR
Reed-Solomon

Given that P is a parity block calculated over A and B data blocks

A XOR B XOR P = 1
A XOR B XOR P = 0

Choose the property of XOR function due to which "blank disks litter the parity analysis"

A XOR A = 0
A XOR 0 = A
A XOR B = B XOR A

A row of [A,B,P] blocks is even if

A XOR B XOR P = 0
A XOR B XOR P = 1

Choose the correct statement

A XOR B > B XOR A
A XOR B = B XOR A
A XOR B < B XOR A

What is calculated in parity analysis?

percent of parity matches in disk pairs
percent of parity matches in disk set
percent of zero rows in disk set

Choose the property of XOR function due to which "mirrors are always even"

A XOR 0 = A
A XOR B = B XOR A
A XOR A = 0

Look at the picture on the right and guess the possible RAID level

Full RAID5
RAID 5 with a blank disk
RAID 5 with a missing disk