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General requirements
For Axxon One VMS operation, the disk subsystem should match the following requirements:
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 아카이브 작업을 위한 콘솔 유틸리티).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.
Storage requirements
The disk subsystem capacity of Axxon One Server should 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 be considered.
Minimum requirements
You need at least 10 GB of free disk space on Windows OS and 5 GB on Linux OS to install the Axxon One VMS package in the Server and Client configuration.
See the storage calculations below, taking into account the size of the archive, the size of the database and the size of the archive of the system logs.
Size of the archive
The capacity of the disk subsystem can be calculated by the formula:
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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 |
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 |
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 |
System log database
The capacity of the system log database should 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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T is the estimated duration of system log storage, days.
Metadata database
The following formulas can be used to determine the required disk size for the metadata database:
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If you have less than 15 GB of free disk space, the metadata database is overwritten - the new data is written over the oldest data.
The system logs
When calculating the disk subsystem capacity, it is necessary to include at least 1 GB for the system logs archive.
Self-diagnostics service
When calculating disk subsystem capacity, note that self-diagnostics service may generate up to 100 MB of data per day.
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