Idis DA-ES1104 - Page 20

Part 3 - Conguration
20
RAID 1+0
The system saves data on four hard drives by combining RAID 1 and RAID 0. System saves data across two hard drives
and simultaneously mirrors the data on the two remaining hard drives. It prevents data loss in case of a failure of up to
two drives. It enhances data transfer speed and data stability, while decreasing the capacity by half.
If a hard drive failure has occurred, the system will be able to continue transferring data. However, it is strongly
recommended that you replace the failed hard drive and rebuild RAID as soon as possible.
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3
5
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6
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HDD 1
RAID 1 RAID 1
RAID 0
HDD 2 HDD 3 HDD 4
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Data
The following table shows when data will be preserved or lost, depending which hard drives failed.
(O: Preserved, X: Lost)
Failed HDD HDD1 HDD2 HDD3 HDD4
HDD1 – X O O
HDD2 X – O O
HDD3 O O – X
HDD4 O O X –