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RAID Recovery Course - Overall Test
What is the correct order of the content analysis stages in ReclaiMe Pro?
mirror analysis, ratio of zeros, parity analysis
ratio of zeros, mirror analysis, parity analysis
parity analysis, ratio of zeros, mirror analysis
Check what ratio of zeros helps exclude
blank disks
hotspare disks
damaged disks
stray disks
RAID5 disks
What does content analysis help determine?
disk order
RAID level
block size
Is it possible to recover data form a RAID0 in which one of the member disks failed?
no, for all practical purposes it is impossible since all you get are files no larger than block size
yes, all the data can be recovered
yes, but only half of the data can be recovered
If data recovered from a RAID is incorrect it means that
both filesystem or RAID recovery might fail, investigation is needed
RAID configuration recovery failed
filesystem recovery failed
Look at the picture on the right and guess the possible RAID level
RAID6 with a missing disk
Full RAID 6 with a hotspare
Full RAID6
RAID 5 with a blank disk
When to apply entropy analysis?
before content analysis
between zero and mirror analysis
after content analysis
Check what you can get with entropy analysis
block size
spot synchronous RAIDs
spot asynchronous RAIDs
original number of disks
disk order ideas
NASes only use software RAID
true
false
What is the recommended approach to check the quality of RAID recovery
check large files, larger than several block sizes
folder tree check is enough
check many small files, smaller or equal to block size
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