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6.4.3
RAID
T he RAID function (Redundant Arrays of Independent Disks) can enable multiple hard disks
to act as one, and the data will be spread out over the disks in one of several ways which are
called "RAID levels". The NVR only supports RAID 5, which can increase disk read and write
speed, offer fault tolerance and provide efficient use of storage space.
Note:
1. To establish a RAID 5 volume, a minimum of three HDDs are required.
2. It's highly recommended to use enterprise level and anti-rotational vibration HDDs with
the same Brand, Model and Capacity.
3. Hot swapping function is not supported. Removing the HDDs without powering off the
NVR will reboot the NVR automatically.
RAID Type:
Off: No RAID.
RAID 5: It takes at least three HDDs to build up a RAID 5, and only one of the HDDs will be
used for recovering data while the rest of the HDDs will be used for data storage purpose.
Hence, the RAID 5 array will not be destroyed by a single drive failure because the system
can recover the data on the remaining disks. However, if more than one disk fail, the data
will be missed and cannot be recovered.
Figure 6-28
RAID 5
A1
A2
B1
B2
C1
C
p
D
D1
p
85
A3
A
p
B
B3
p
C2
C3
D2
D3
ENVR8304D-8CH
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