ReclaiMe Data Recovery Training

RAID Recovery Course - Content Analysis Test

Look at the picture on the right and guess RAID level

full 4-disk RAID 5
4-disk RAID 5 with one disk missing
RAID0
3-disk RAID 5 with a hotspare

What does content analysis help determine?

block size
disk order
RAID level

Rows in a parity-based RAID are always even

true
false

Check the possible RAID levels if parity analysis gives you 0% parity both for full disk set and exclusion combinations

Check for what parity tests are done

full disk set
each member disk
all combinations with one disk excluded
all disk pairs

If you see several mirror pairs in mirror map, it points to

RAID5
RAID10
RAID1
Ex-hotspare disk

You should do mirror analysis before parity analysis because

parity analysis destroys mirror data
mirrors are always even and therefore parity analysis does not apply to mirrors
mirror analysis helps calculate parity more accurately

Ratio of data similarity is calculated for

all possible disk pairs
each member disk separately

1-5% ratio of data similarity points to

different disks
ex-hotspare disk
mirror pair

What does parity analysis calculate?

percent of parity matches in each disk
percent of parity matches in disk set
percent of parity matches in each disk pair

Next lesson - Parity Analysis

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