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RAID Recovery Course - Overall Test
NASes only use software RAID
false
true
Check what ratio of zeros helps exclude
stray disks
blank disks
RAID5 disks
hotspare disks
damaged disks
Is it possible to recover data if one of the member disks in a RAID5 failed?
no
depends on which disk failed
yes, all data is recoverable
yes, but only part of the data is recoverable
Look at the picture on the right and guess the possible RAID level
RAID 5 with a missing disk
RAID10
Full RAID5
Full RAID 5 with a hotspare
When to apply parity analysis?
after zero and mirror analysis
after entropy analysis
before zero and mirror analysis
between zero and mirror analysis
Look at the picture on the right and guess the possible RAID level
Full RAID6
RAID6 with a missing disk
RAID 5 with a blank disk
Full RAID 6 with a hotspare
When to apply entropy analysis?
after content analysis
before content analysis
between zero and mirror analysis
Check what you can get with entropy analysis
spot synchronous RAIDs
block size
spot asynchronous RAIDs
disk order ideas
original number of disks
Check what you can do with entropy analysis
notice that start offset doesn't equal zero
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
Look at the picture on the right and choose the most complete configuration
full 4-disk RAID5, 16 KB block size
4-disk RAID5 with one disk missing, 32 KB block size
full 4-disk RAID5, 64 KB block size
full 4-disk RAID5, 32 KB block size
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