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Table of Contents

General requirements

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

  1. The device must have no less IOPS the Axxon Next VMS.
    The Axxon Next 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 Next 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.

Storage requirements

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. 

Minimum requirements

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

Please see the storage calculations below, taking into account space needed for video footage, databases and system logs.

Size of archives

Size of disk subsystem can be calculated by formula:

...

Recording parameters

Calculating results

4 cameras with 25 fps and 640х480 resolution, guaranteed recording of 24 hours per day during one week

H.264: from 500 GB to 1 TB
MPEG4: from 500 GB to 2 TB
MJPEG: from 1.3 TB to 3.5 TB

16 cameras with 12 fps and 640х480 resolution, guaranteed recording of 12 hours per day during one week

H.264: from 500 GB to 1 TB
MPEG4: from 500 GB to 2 TB
MJPEG: from 1.3 TB to 3.5 TB

4 cameras with 25 fps and 1280х960 resolution, guaranteed recording of 24 hours per day during one week

H.264: from 2 TB to 4 TB
MPEG4: from 2 TB to 8 TB
MJPEG: from 5.3 TB to 14 TB

Database of the system log

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:

...

T is the estimated duration of syslog storage, days.

Object trajectory database 

The following formulas can help to determine the required disk size for the trajectory database:

...