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RAID Recovery Course - Content Analysis Test
If you see one partial mirror pair (60-80%) in mirror map, it points to
RAID10
Ex-hotspare disk
RAID1
RAID5
What does parity analysis calculate?
percent of parity matches in disk set
percent of parity matches in each disk pair
percent of parity matches in each disk
Parity test for a full regular RAID5 gives
0% parity in full disk set and 100% parity in all combinations with one disk excluded
0% parity in full disk set and 0% parity in all combinations with one disk excluded
100% parity in full disk set and 0% parity in all combinations with one disk excluded
Look at the picture on the right and check the possible RAID level(s)
RAID10
full RAID5
RAID0
RAID 5 with a missing disk
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
Regular RAID5
RAID0
60-80% ratio of data similarity points to
ex-hotspare disk or out-of-sync mirror
different disks
mirror pair
Rows in a parity-based RAID are always even
false
true
Look at the picture and choose the possible variant
Disks {4,5,6} belong to one RAID; Disk 7 is a hotspare
Disks {5,6,7} belong to one RAID; Disk 4 is a hotspare
Disks {4,5,7} belong to one RAID; Disk 6 is a hotspare
Check what ratio of zeros helps exclude
RAID5 disks
damaged disks
blank disks
stray disks
hotspare disks
Ratio of data similarity is calculated for
all possible disk pairs
each member disk separately
Next lesson - Parity Analysis
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