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Size of disk subsystem will be calculated on the basis of frame resolution and compression, rate of video signal frames per second, number of cameras recording events to the hard drives and other recording parameters.

Size of disk subsystem can be calculated by formula:

Size of Disk subsystem (Mb) = Time of storing an archive (days) x Cameras number x Rate of recording (fps) x3,51 x Time of guaranteed recording from a camera (h / day) x Average frame size (Kb), Where

where Time of storing an archive is the required time of storing an archive from one camera, days;

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Rate of recording is the frame rate of recording to the archive, frames per second;

3,51= (60 sec in min x 60 min in hour)/(1024 kb in Mb) – is the coefficient used for kb/s-Mb/h conversion,

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Average frame size is the average size of the camera frame, kilobytes.
NOTE 1.

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The size of syslog database is to be taken into account when the size of disk subsystem is calculated. Estimated size of syslog database is calculated by formulas:

Size of syslog database = D*T*(0,5 Gbday5Gb / day) (enough),

Size of syslog database = D*T*1 Gbday(1Gb / day) (more than enough),

where D is the total number of detectors created in system,

T is the estimated duration of syslog storage, days.

Examples of calculating a size of disk subsystem (without size of syslog database) are presented below.