ReclaiMe Data Recovery Training

RAID Recovery Course - Content Analysis Test

What is the first step in RAID recovery?

parity analysis
content analysis
entropy analysis

Check for what parity tests are done

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

1-5% ratio of data similarity points to

mirror pair
different disks
ex-hotspare disk

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

full RAID5
RAID10
RAID 5 with a missing disk
RAID0

Rows in a parity-based RAID are always even

false
true

Look at the picture on the right and guess RAID level

RAID1
RAID0
RAID5
RAID10

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

RAID5
RAID1
RAID10
Ex-hotspare 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 guess RAID level

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

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

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

Next lesson - Parity Analysis

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