ReclaiMe Data Recovery Training

RAID Recovery Course - Entropy Analysis Test

What has the higher entropy?

data block in a RAID
parity block in a RAID

Choose the correct statement

random data has high entropy
ordered data has high entropy

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

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

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 appropriate description

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

Check the parameters you should vary in entropy analysis

RAID level
block size
disk order
number of disks

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

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

Check the criteria of a correct picture in entropy analysis

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

How to do entropy analysis

change settings to make pictures match expectations
launch the analysis and wait until ReclaiMe Pro gives you the correct RAID configuration

Choose to what you should apply the entropy analysis

each disk separately
full disk set

Next lesson - Parity Analysis

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