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 disk set
percent of parity matches in each disk pair

Check for what parity tests are done

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

Parity test for a full regular RAID5 gives

100% parity in full disk set and 0% parity in all combinations with one disk excluded
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

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

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

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

RAID10
RAID5
RAID0
RAID1

Look at the picture and choose the possible variant

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

Look at the picture on the right and guess RAID level

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

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

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

Check what content analysis in ReclaiMe Pro includes

ratio of zeros
mirror analysis
ratio of files to folders
analysis of different file types

Next lesson - Parity Analysis

We have a mailing list in which we talk about interesting cases we encounter and share some tips and tricks.