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Table of Contents

General requirements

For Axxon One VMS operation, the disk subsystem must match the following requirements:

  1. The device must have no less IOPS the Axxon One VMS.
    The Axxon One VMS records video footage to archive volumes in 4MB blocks with a 10 second interval. If the most recent block is not full after 10 seconds, it will be filled up later.
    Similarly, footage is played back in blocks (except for re-indexation, see the utility for archive management Console utility for working with archives).
    This is how you can estimate the IOPS value for the Axxon One VMS.


    If average bitrate per camera is less than 3.6 Mbps

    If average bitrate per camera exceeds 3.6 Mbps

    IOPS during archive recording
    Archive recording includes both data input (writing) and output (reading) operations

    IOPS (writing) = 0,29 * N

    IOPS (reading) = 0,035 * M

    IOPS (writing) = 0,065 * M

    IOPS (reading) = 0,035 * M

    IOPS during archive playback
     Archive playback includes only output (reading) operations

    IOPS (reading) = 0,035 * R * S

    IOPS during simultaneous recording and playback

    IOPS (writing) = 0,29 * N

    IOPS (reading) = 0,035 * M + 0,035 * R * S

    IOPS (writing) = 0,065 * M

    IOPS (reading) = 0,035 * M + 0,035 * R * S

    where

    • N is the number of camera channels being recorded;
    • M is the cumulative bitrate over all camera channels being recorded, in Mbps;
    • R is the cumulative bitrate over all camera channels being played back at normal speed (1x), in Mbps;
    • S is the playback speed.


  2. If you use RAID storage, please specify write-back policy for writing to cash memory.

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You need at least 10 GB of free disk space for Windows OS and 5 GB for Linux OS to install the Axxon One VMS package in a Server and Client configuration.

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Info
titleNote

Average frame size for 640х480 resolution is:

Video codec

Average frame size

H.264

from 8 KB to 17 KB

MPEG4

from 8 KB to 35 KB

MJPEG

from 23 KB to 60 KB

Average frame size may vary over a wide range depending on the vendor, model and settings of the camera and video image complexity.


Info
titleNote

To calculate the frame size one can use the ratio, that while increasing vertical or horizontal resolution two times, the average frame size will be increased four times (this rule is a relative one and can be applied only to some cameras' models).


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

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