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For Axxon One VMS operation, the disk subsystem should must match the following requirements:
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) operationsIOPS (recording) = 0.29 * N
IOPS (reading) = 0.035 * MIOPS (recording) = 0.065 * M
IOPS (reading) = 0.035 * MIOPS during archive playback
Archive playback includes only output (reading) operationsIOPS (reading) = 0.035 * R * S
IOPS during simultaneous recording and playback
IOPS (recording) = 0.29 * N
IOPS (reading) = 0.035 * M + 0.035 * R * SIOPS (recording) = 0.065 * M
IOPS (reading) = 0.035 * M + 0.035 * R * Swhere
- 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.
- 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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Average frame size of 640х480 640x480 resolution is:
Average frame size may vary over a wide range depending on the vendor, the model and the settings of the camera and video image complexity. |
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To calculate the frame size you can use the ratio, that when increasing the vertical or horizontal resolution two times, the average frame size will be increased four times (this rule is a relative and can be applied only to some camera models). |
Examples of calculating the capacity of the disk subsystem (without the capacity of the system log and metadata databases) are presented below.
Recording parameters | Calculating results |
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4 cameras with 25 FPS and 640х480 640x480 resolution, guaranteed recording of 24 hours per day during one week | H.264: from 500 GB to 1 TB |
16 cameras with 12 FPS and 640х480 640x480 resolution, guaranteed recording of 12 hours per day during one week | H.264: from 500 GB to 1 TB |
4 cameras with 25 FPS and 1280х960 1280x960 resolution, guaranteed recording of 24 hours per day during one week | H.264: from 2 TB to 4 TB |
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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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