ReclaiMe Data Recovery Training

RAID Recovery Course - Overall Test

When you should do parity analysis?

always
when content analysis is done but RAID level is still unknown
after entropy analysis

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

Is it possible to recover data if one of the member disks in a RAID5 failed?

no
yes, but only part of the data is recoverable
yes, all data is recoverable
depends on which disk failed

Is it possible to recover data if one of the member disks in a RAID10 failed?

yes, all data is recoverable
no
depends on which disk failed
yes, but only part of the data is recoverable

Look at the picture on the right and guess the possible RAID level

RAID10
Full RAID5
RAID 5 with a missing disk
Full RAID 5 with a hotspare

If data recovered from a RAID is incorrect it means that

filesystem recovery failed
RAID configuration recovery failed
both filesystem or RAID recovery might fail, investigation is needed

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
check many small files, smaller or equal to block size
folder tree check is enough

What does content analysis help determine?

disk order
RAID level
block size

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