Vivotek NR9581 - Understanding RAID Levels and Fault Tolerance

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42 - User's Manual
RAID Fault Tolerance
RAID level No. of tolerable drive failure
0 No fault tolerance
1 1, each drive group
5 1
6 2
10 multiple, as long as each failure is in a separate drive group
50 1 in each drive group
60 2 in each drive group
RAID10
Mirror Mirror Mirror Mirror Mirror Mirror
RAID0
RAID1 RAID1 RAID1 RAID1 RAID1 RAID1
For example, if disk failure occurs in different drive groups, a RAID10 conguration can
tolerate multiple drive failures. In each RAID1 drive group, data is mirrored to a counterpart
disk drive. Data remains intact if one disk drive should fail in each drive group.
Consistency Check
The consistency check operation veries the correctness of the data in virtual drives that use
RAID levels 1, 5, 6, 10, 50, and 60. RAID0 does not provide data redundancy. In a system with
parity, check consistency means calculating the data on one drive and comparing the results to
the contents of the parity drive.