ReclaiMe Data Recovery Training

RAID Recovery Course - Entropy Analysis Test

Look at the picture on the right and choose the appropriate description

selected block size is larger than the actual block size
selected block size is less than the actual block size
selected number of disks is wrong

Entropy is a measure of data randomness

false
true

Choose that which has the highest entropy

text
parity in a RAID
video

When to apply entropy analysis?

after content analysis
between zero and mirror analysis
before content analysis

Choose to what you should apply the entropy analysis

full disk set
each disk separately

Look at the picture on the right and choose the most complete configuration description

full 4-disk RAID5, 32 KB block size
4-disk RAID5 with one disk missing, 16 KB block size
full 3-disk RAID5, 16 KB block size, topmost disk doesn't belong to the RAID

Check the parameters you should vary in entropy analysis

number of disks
RAID level
block size
disk order

Choose the correct statement

ordered data has high entropy
random data has high entropy

Look at the picture on the right and choose the most complete configuration description

full 4-disk RAID5, 32 KB block size
4-disk RAID5 with one disk missing, 16 KB block size
full 4-disk RAID5, 64 KB block size
full 4-disk RAID5, 16 KB block size

Next lesson - Parity Analysis

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