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RAID Recovery Course - Entropy Analysis Test
Check what you can get with entropy analysis
block size
original number of disks
spot synchronous RAIDs
disk order ideas
spot asynchronous RAIDs
Entropy is a measure of data randomness
true
false
Look at the picture on the right and choose the most complete configuration description
4-disk RAID5 with one disk missing, 16 KB block size
full 4-disk RAID5, 32 KB block size
full 3-disk RAID5, 16 KB block size, topmost disk doesn't belong to the RAID
Choose that which has the lowest entropy
video
text
parity in a RAID
What has the higher entropy?
parity block in a RAID
data block in a RAID
What analysis gives you a visual representation of parity blocks?
parity analysis
ratio of zeros analysis
entropy analysis
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
Check the parameters you should vary in entropy analysis
RAID level
number of disks
disk order
block size
Choose the correct statement
ordered data has high entropy
random data has high entropy
Choose that which has the highest entropy
text
parity in a RAID
video
Next lesson - Parity Analysis
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