ReclaiMe Data Recovery Training

RAID Recovery Course - Content Analysis Test

What does parity analysis calculate?

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

Check for what parity tests are done

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

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

If in parity analysis you see 0% parity for full disk set and 100% parity with one disk excluded, what the array level is?

RAID5 with a missing disk
RAID5 with a hotspare disk
certain type of RAID6
full regular RAID5

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

Look at the picture on the right and guess RAID level

RAID5
RAID1
RAID0
RAID10

Look at the picture and choose the possible variant

Disks {5,6,7} belong to one RAID; Disk 4 is a hotspare
Disks {4,5,6} belong to one RAID; Disk 7 is a hotspare
Disks {4,5,7} belong to one RAID; Disk 6 is a hotspare

Look at the picture on the right and guess RAID level

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

Look at the picture on the right and check the possible RAID level(s)

full RAID5
RAID0
RAID10
RAID 5 with a missing disk

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

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

Next lesson - Parity Analysis

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