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

Check the parameters you should vary in entropy analysis

RAID level
block size
number of disks
disk order

What analysis gives you a visual representation of parity blocks?

parity analysis
entropy analysis
ratio of zeros analysis

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

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

Check the criteria of a correct picture in entropy analysis

has several peaks
peaks do not overlap
there is one overlap in peaks
has one peak per disk

Entropy is a measure of data randomness

true
false

Choose that which has the highest entropy

text
video
parity in a RAID

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

full 4-disk RAID6, 128 KB block size
full 4-disk RAID5, 128 KB block size
full 4-disk RAID6, 256 KB block size
full 4-disk RAID5, 256 KB block size

When to apply entropy analysis?

before content analysis
after content analysis
between zero and mirror analysis

Next lesson - Parity Analysis

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