ReclaiMe Data Recovery Training

RAID Recovery Course - Content Analysis Test

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

RAID10
RAID 5 with a missing disk
RAID0
full RAID5

If you see one partial mirror pair (60-80%) in mirror map, it points to

RAID5
Ex-hotspare disk
RAID1
RAID10

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 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

Is it needed to know RAID level to recover data?

no
yes
only if you need a full scale RAID recovery (RAID metadata is severely damaged)

95-100% ratio of data similarity points to

different disks
ex-hotspare disk
mirror pair

Look at the picture and choose the possible variant

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

Check for what parity tests are done

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

Rows in a parity-based RAID are always even

true
false

1-5% ratio of data similarity points to

different disks
mirror pair
ex-hotspare disk

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

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

Next lesson - Parity Analysis

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