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Note
titleAttention!

The 3.6 Mbps limit is approximate. When calculating, keep in mind that when writing an archive, both write (input) and read (output) operations are performed simultaneously, which are necessary for service purposes.

Camera average bitrateWrite IOPSRead IOPS
Archive recording only
Less than ~3.6 Mbps0.29 × N0.035 × M
More than ~3.6 Mbps0.065 × M0.035 × M
Archive playback only
When viewing, only read operations are performed0.035 × R × S
Simultaneous recording and viewing of the archive
Less than ~3.6 Mbps0.29 × N0.035 × M + 0.035 × R × S
More than ~3.6 Mbps0.065 × M0.035 × M + 0.035 × R × S
Tip

Names of variables

  • N is the number of cameras recording to the archive.
  • M is the total bitrate (Mbps) of all cameras participating in the recording.
  • R is the total bitrate (Mbps) of cameras played back from the archive (at 1x speed).
  • S is the playback speed (for example, 2.0 for fast playback).

Recommendations for disk arrays (RAID)

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The average bitrate depends on the codec, camera manufacturer, compression settings, scene dynamics, resolution, and hardware settings (see Platform Calculator). Examples for 1920x1080 resolution:

Video codecBitrate
H.2644 Mbps
H.2652.6 Mbps
Example of calculation (without the log database and metadata database) for 1920×1080 resolution
Recording parametersCalculation results (total capacity)
4 cameras, 25 FPS, 1920×1080, 24/7 recording, 7-day storage
  • H.264: ~1,15 TB
  • H.265: ~0,75 TB

Calculation for the system log database

The size of the system log database depends on the number of configured detectors and their activity.

Detector activityСalculation formula
LowD × T × 0.04 GB
MediumD × T × 0.12 GB
HighD × T × 0.48 GB
Tip

Names of variables

  • D is the total number of detectors in the system.
  • T is the storage period (days) of the system log.

Calculation for the metadata database

We recommend calculating the size for the metadata database using one of the formulas, depending on the need to reserve space.

SizeСalculation formula
SufficientN × T × 0.5 GB
With marginN × T × 1 GB
With a large marginN × T × 5 GB
Tip

Names of variables

  • N is the number of detectors with enabled metadata recording (multiple detectors can be enabled for a single camera; see Metadata database).
  • T is the period (days) of metadata storage. The default value is 30 days.
Note
titleAttention!

If free disk space drops to 15 GB, the overwriting mechanism automatically starts: new data is written over the oldest data.

Additional requirements

When you plan disk space, consider the following:

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