ReclaiMe Data Recovery Training

RAID Recovery Course - Content Analysis Test

95-100% ratio of data similarity points to

mirror pair
ex-hotspare disk
different disks

You should do mirror analysis before parity analysis because

mirrors are always even and therefore parity analysis does not apply to mirrors
mirror analysis helps calculate parity more accurately
parity analysis destroys mirror data

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

Ex-hotspare disk
RAID1
RAID10
RAID5

Is it needed to know RAID level to recover data?

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

1-5% ratio of data similarity points to

different disks
mirror pair
ex-hotspare disk

Look at the picture on the right and guess RAID level

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

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

RAID1
Ex-hotspare disk
RAID10
RAID5

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

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

RAID0
RAID10
full RAID5
RAID 5 with a missing disk

Rows in a parity-based RAID are always even

true
false

Next lesson - Parity Analysis

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