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RAID Recovery Course - Content Analysis Test
Is it needed to know RAID level to recover data?
yes
no
only if you need a full scale RAID recovery (RAID metadata is severely damaged)
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
certain type of RAID6
full regular RAID5
RAID5 with a hotspare disk
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
95-100% ratio of data similarity points to
ex-hotspare disk
mirror pair
different disks
Ratio of data similarity is calculated for
each member disk separately
all possible disk pairs
What is the first step in RAID recovery?
entropy analysis
content analysis
parity analysis
Look at the picture and choose the possible variant
Disks {4,5,7} belong to one RAID; Disk 6 is a hotspare
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
60-80% ratio of data similarity points to
mirror pair
different disks
ex-hotspare disk or out-of-sync mirror
If you see one partial mirror pair (60-80%) in mirror map, it points to
RAID1
RAID5
RAID10
Ex-hotspare disk
Check what ratio of zeros helps exclude
stray disks
blank disks
damaged disks
RAID5 disks
hotspare disks
Next lesson - Parity Analysis
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