ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

Which parity function is usually used in a RAID5?

Lempel, Ziv, Welch
Huffman
Reed-Solomon
XOR

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

full 4-disk Promise RAID6 or full 4-disk RAID5
4-disk RAID 5 with one disk missing
3-disk RAID 5 with a hotspare

Parity is a special function calculated over data blocks

false
true

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

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

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

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

Full RAID6
Full RAID 5 with a hotspare
RAID 5 with a missing disk
RAID 6 with a missing disk

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

RAID 5 with a blank disk
Full RAID6
RAID6 with a missing disk
Full RAID 6 with a hotspare

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

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 correct statement

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

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