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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 (megabytes) 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) 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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Average frame size is the average size of the camera frame , kilobytesin KB.
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Average frame size of 640х480 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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Size of metadata database = N N * T T * (0.5GB 5 GB / day) – sufficient disk size;
Size of metadata database = N * T * (1GB 1 GB / day) – sufficient disk size plus reserve space;
Size of metadata database = N * T * (5GB 5 GB / day) – sufficient disk size plus a large reserve,
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When calculating the disk subsustem subsystem capacity, it is necessary to include at least 1 GB for the system logs archive.
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When calculating disk subsystem capacity, note that self-diagnostics service may generate up to 100 Mbytes MB of data per day.
The depth of the service internal database is limited to 7 days and 512 MB.
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