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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
RAID5 with a hotspare disk
RAID6
RAID5 with a missing disk
RAID0
Regular RAID5
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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