ReclaiMe Data Recovery Training

RAID Recovery Course - Entropy Analysis Test

Check what you can do with entropy analysis

spot the disks which do not belong to the RAID in question
notice that start offset doesn't equal zero
spot the disks which do not form a parity-based array
detect the first disk in the RAID

Entropy is a measure of data randomness

false
true

What analysis gives you a visual representation of parity blocks?

ratio of zeros analysis
entropy analysis
parity analysis

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

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

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

Check the parameters you should vary in entropy analysis

RAID level
number of disks
disk order
block size

Choose to what you should apply the entropy analysis

full disk set
each disk separately

Check the criteria of a correct picture in entropy analysis

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

Next lesson - Parity Analysis

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