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  1. The number of input/output operations (IOPS) of the device should 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).

    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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