145
B
Appendix B - Example S
torage Server Conditions
Bandwidth and Disk Space
The bandwidth and disk space requirements for using VK-64 can be determined by
calculating the recording frame rate, number of camera servers and frame size.
For example, a system using:
16 camera servers (VB-C50i) each recording continuously at 5 fps,
With each camera set to Medium Size for video capture and Quality set to 50, and
Frame size* per single frame is approximately 15 KB...
...requires a bandwidth for a single camera server of approximately:
600Kbps (15KB x 8bit x 5fps).
In this case, the total bandwidth for 16 camera servers would be approximately 9.6Mbps
(600Kbps X 16 cameras = 9600Kbps).
*The frame size figure shown above is an example. Please note that the actual frame size
varies depending on the video content.
The recording throughput required by the Storage Server is not the
total traffic on the network, as this does not include viewing of live
cameras and playback of recorded video by Viewers, and any other
network traffic.
Note
The above figure can also be used to calculate the hard disk requirements used by the
Storage Server. For the above configuration, if the 16 Camera Servers are being recorded
continuously at 5 frames per second all day, every day, the disk requirements would be
approximately 100GB per day (15KB x 5fps x 16 cameras x 60 seconds x 60 minutes x 24
hours = 103680000KB per day).
However, when determining hard disk sizes it is important to take into account that there
needs to be some ‘overhead’. For example, if the [Maximum file size/duration] (
t
P. 23) is
configured to 1024MB (1GB), a video file of 1GB is created per every single camera
server. Therefore when the Storage Server deletes old recorded data, the full 1GB will be
deleted according to the disk space management description (
t
P. 24) and disk space
management operating examples (
t
P. 146); with 16 Camera Servers, totalling 16GB.
So, for example, the above-mentioned hard disk requirements could be increased by 16GB
to deal with this situation.
As the above figures are for continual recording, the hard disk usage can be substantially
reduced by using sensor-based or motion-based recording and/or by limiting recording to
certain times of the day or days of the week. The disk usage that would result from
applying these settings would depend greatly on the frequency of occurrence of such
sensor and motion events and the number of defined days and times therein.
For the above figures please note that the bandwidth is calculated as 1000Kbps = 1Mbps,
and the disk size as 1024KB = 1MB.
