ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

Parity test for a Promise RAID6 gives:

0% parity in full disk set and 0% 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 100% parity in all combinations with one disk excluded

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

When to apply parity analysis?

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

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

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

Parity is a special function calculated over data blocks

false
true

Choose the correct statement

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

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

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

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

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

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

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

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

Next lesson - Entropy analysis

We have a mailing list in which we talk about interesting cases we encounter and share some tips and tricks.