ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

When to apply parity analysis?

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

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

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

A XOR A = 0
A XOR 0 = 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

Check for what parity tests are done

each disk separately
all disk combinations with one disk excluded
full disk set

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

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