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