ReclaiMe Data Recovery Training

RAID Recovery Course - Parity Analysis Test

What is calculated in parity analysis?

percent of parity matches in disk pairs
percent of zero rows in disk set
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 0 = A
A XOR B = B XOR A
A XOR A = 0

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

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

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

Parity test for a Promise RAID6 gives:

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
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 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

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 the possible RAID level

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

When to apply parity analysis?

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

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

Next lesson - Entropy analysis

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