ReclaiMe Data Recovery Training
Home
RAID
Partition
Filesystem
NAS
Tricks
Contact
About us
RAID Recovery Course - Entropy Analysis Test
What has the higher entropy?
parity block in a RAID
data block 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 RAID5, 256 KB block size
full 4-disk RAID6, 256 KB block size
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
Check what you can do with entropy analysis
detect the first disk in the RAID
spot the disks which do not form a parity-based array
spot the disks which do not belong to the RAID in question
notice that start offset doesn't equal zero
Choose that which has the lowest entropy
text
parity in a RAID
video
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, 64 KB block size
full 4-disk RAID5, 32 KB block size
full 4-disk RAID5, 16 KB block size
Check what you can get with entropy analysis
disk order ideas
original number of disks
block size
spot asynchronous RAIDs
spot synchronous RAIDs
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 3-disk RAID5, 16 KB block size, topmost disk doesn't belong to the RAID
full 4-disk RAID5, 32 KB block size
Check RAID types to which entropy analysis is applied
RAID5
RAID6
RAID1
RAID0
JBOD
RAID10
Entropy is a measure of data randomness
true
false
Next lesson - Parity Analysis
Copyright © 2013 - 2019
www.ReclaiMe.com
We have a mailing list
in which we talk about interesting cases we encounter and share some tips and tricks.