ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

Choose the correct statement

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

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

Choose the correct statement

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

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

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

When to apply parity analysis?

before zero and mirror analysis
after entropy analysis
after zero and mirror analysis
between zero and mirror analysis

Parity is a special function calculated over data blocks

true
false

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

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

Choose the correct statement

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

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

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

Parity test for a Promise RAID6 gives:

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
0% parity in full disk set and 0% parity in all combinations with one disk excluded

Next lesson - Entropy analysis

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