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

  1. The number of input/output operations (IOPS) of the device should must not be less than the IOPS of Axxon One VMS.
    Axxon One records the archive in blocks of 4 MB every 10 seconds. However, if the block is not filled in 10 seconds, a smaller fragment of the block will be recorded, which will be added to later.
    Archive playback is also performed in blocks (except when reindexing, see Console utility for working with archives (vfs_format.exe)).

    Below you can see how you can estimate the IOPS for Axxon One VMS.


    If the average bitrate per camera is less than ~3.6 Mbps

    If the average bitrate per camera exceeds ~3.6 Mbps

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

    IOPS (recording) = 0.29 * N

    IOPS (reading) = 0.035 * M

    IOPS (recording) = 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 (recording) = 0.29 * N

    IOPS (reading) = 0.035 * M + 0.035 * R * S

    IOPS (recording) = 0.065 * M

    IOPS (reading) = 0.035 * M + 0.035 * R * S

    where

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


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

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The disk subsystem capacity of Axxon One Server should must be estimated taking into account the resolution, the compression algorithm, the frame rate of the recorded video signal, the number of video cameras from which the recording to disk(s) takes place and other recording parameters. In addition, the size of the system log and metadata databases should must be considered.

Minimum requirements

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The capacity of the system log database should must be taken into account when the capacity of the disk subsystem is calculated. The estimated capacity of the system log database is calculated by the formulas:

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N is the number of detection tools in the system actively recording metadata. One video camera can have several detection tools with metadata (see General information on metadataMetadata database),

T is the period of time (number of days) that metadata will be stored. By default, T = 30 days.

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