18
●
HDD fault-tolerance system
The RAID function is available as the HDD fault-tolerance
system.
In addition to the RAID 5 mode that recovers data when a sin-
gle hard disk drive becomes faulty, there is RAID 6 mode that
can recover data even if 2 hard disk drives become faulty.
Operation in the RAID mode is one of the solutions as the HDD
fault-tolerance system that prevents data loss when handling a
large amount of data on a large amount of storage.
Note:
• To use in the RAID 5 or the RAID 6 mode, it is necessary to
install 3 or more hard disk drives and 4 or more hard disk
drives respectively.
• Logical disk capacity when using in the RAID 5 mode
Logical disk capacity = Capacity of the smallest among the
hard disk drives in the recorder x (number of the hard disk
drives in the recorder – 1)
• Logical disk capacity when using in the RAID 6 mode
Logical disk capacity = Capacity of the smallest among the
hard disk drives in the recorder x (number of the hard disk
drives in the recorder – 2)
• Depending on the model of the hard disk drive, the avail-
able capacity may be a few percent smaller.
■
Recording/Playback
●
Stable image recording and playback
High throughput is achieved by equipping the camera port and
the client PC port individually. It brings stable image reception
using up to 64 cameras and up to 16 client PCs (depending on
the network environment).
Recording
Images from up to 64 cameras can be recorded on hard disk
drives in a single recorder. Recording images in JPEG,
M-JPEG and MPEG-4 format are available.
Playback
Images recorded on hard disk drives in a single recorder can
be transmitted to up to 16 PCs, and they can be played on the
PCs.
Live image transmission
Live images from up to 64 cameras can be transmitted to up
to 16 PCs via a single recorder.
C 4
C 3
C 2
Q 1
B 4
B 3
Q 2
P 1
A 4
Q 3
P 2
C 1
Q 4
P 3
B 2
B 1
P 4
A 3
A 2
A 1
RAID 6
Network cameras
Recorder
Image data
PC
HDD
HDD
Network cameras
Recorder
Image data
PC
HDD
Network cameras
Recorder
Image data
PC
