Home
RAID
Partition
Filesystem
NAS
Tricks
Contact
About us
RAID Recovery Course - Content Analysis Test
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
Check what content analysis in ReclaiMe Pro includes
ratio of zeros
mirror analysis
ratio of files to folders
analysis of different file types
If you see several mirror pairs in mirror map, it points to
Ex-hotspare disk
RAID5
RAID1
RAID10
Is it needed to know RAID level to recover data?
only if you need a full scale RAID recovery (RAID metadata is severely damaged)
yes
no
Check the possible RAID levels if parity analysis gives you 0% parity both for full disk set and exclusion combinations
RAID5 with a hotspare disk
Regular RAID5
RAID6
RAID5 with a missing disk
RAID0
Look at the picture on the right and guess RAID level
RAID0
RAID10
RAID5
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 check the possible RAID level(s)
RAID 5 with a missing disk
RAID10
RAID0
full RAID5
Can data recovery software detect RAID level automatically?
yes
no
yes, in case of RAID5
You should do mirror analysis before parity analysis because
parity analysis destroys mirror data
mirrors are always even and therefore parity analysis does not apply to mirrors
mirror analysis helps calculate parity more accurately
Next lesson - Parity Analysis