ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

Parity is a special function calculated over data blocks

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What is calculated in parity analysis?

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

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

Choose the correct statement

A XOR A > 0
A XOR A = 0
A XOR A < 0

Choose the correct statement

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

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

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

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

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

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

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