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Axxon PSIM™ system PSIM allows saving the video recordings to the hard drives (maintain maintaining a video recordings archive). Archived information can be saved to the hard drives of such types as SCSI, IDE, SATA, USB, and also RAID arrays. SCSI disks and RAID arrays (in particular RAID - 5) allow accelerating for accelerated data search and recording.

The size of the redundant disk array defines determines the length (time-based length) of the saved and archived video recording. The size of the redundant disk array is selected based on the required parameters of the video recording.

To determine the disk space required for storing archive storing archive from IP - cameras, please use the on-line online calculator. Documentation on the calculator is available here.

Table The table below shows the average frame size of a PAL video signal depending on frame resolution, video signal compression, the color grade of the image and frame resolution, frame chromaticity, and the motion level in the frame.

You must calculate the archive depth, taking into account the resolution and frame Archive size will be calculated on the basis of frame resolution and compression, image color grade, rate of video signal frames per second, frame rate, and the number of cameras , recording events continuously to the hard drives.

Archive size can be calculated from formula no. 1:

from which recording is performed on disk(s) during continuous recording.

You can use the following formula to calculate the archive depth:

Archive depth Archive size (days) = (1024 (MbMB/GbGB) * 1024 (KbKB/MbMB) * Hard drive size (GbGB)) / (60 (secs/min) * 60 (min/hr) * 24 (hr/day) * Frame size (Kb) * Frame rate (frames/secs) * Number of cameras)

Comments relating related to Formula nothe formula. 1. To estimate the archive sizedepth, you must do the following should be performed: divide the size of the hard drive in Kb KB (the rates for converting Gb GB into Kb KB are included into in the numerator of Formula no. 1) divide the formula) by the frame size, defined in Table A as a function of determined from the table based on the video signal parameters, and by the frame rate per camera and the number of cameras , connected to the video server. Archive size depth in this case will be is measured in seconds. Now, the archive size depth expressed in seconds should must be converted to the number of days (the rates to convert seconds to days are given in the denominator of Formula no. 1the formula).

Example. If For example, if the size of a hard drive , for instance, is 40 GB, 4 four cameras are continuously recording PAL video signals with 10 frames per second and 150 Kb KB frame size. Based on the formula, you work out:

Archive size depth (days) = 12 (KbKB/Gb GB * day/secs) * 40 (GbGB) / (150 (KbKB) * 10 (frames/secs) * 4) = 0.08 (days)

The arithmetic calculation shows , that the video archive size depth in the particular case will be is 0.08 days (about 1 hour 55 minutes).

For the purpose of calculations, frame size can be defined in When you calculate, you estimate the frame size based on the table above.

Table The table below shows archive sizes calculated for hard drives of various sizes, based on a continuous incoming PAL video signal recording , from 1 one camera with a frame rate of 25 f/secFPS.