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How do we build a suitable storage solution for the security system

September 27, 2018

Security video monitoring system can be divided into different parts, and different parts have their unique storage needs. Data acquisition - the front end of the security monitoring system, the camera. The most common storage is Flash memory (Flash)/ SD card, the general capacity of about 256GB.

Edge part - generally NVR connected to the camera and external disk array or NAS. The storage medium used in this section is usually a hard disk. The capacity varies from 3TB to 10TB depending on the number of cameras connected and the quality of the video. Some NVR have AI recognition function, which can preliminarily analyze the video collected in the field and warn. Therefore, the speed and capacity of the storage disk must meet this requirement.

Data center - mainly archive video for a long time and make detailed analysis of video with big data tools. This section will use different kinds of hard drives, video archives will use super large hard drives, and big data analysis will use high speed or near line enterprise hard drives. Then how to build a suitable storage scheme for security system? According to an informal estimate, the number of monitoring data generated by the global monitoring system is about 560 petabytes (1PB=1,000TB) per day, which is expected to increase to 2,500 petabytes per day in 2019. In 2023, 3,500 petabytes of monitoring will be generated daily.

Has boosted the number of surveillance cameras - campus shooting from the United States to bring security risks to the wisdom of the Chinese urban construction has boosted the number of surveillance cameras, surveillance video obtained as more and more high - from 720 p to 1080 p or even super clear 4 k video are greatly increased the video files, monitor video retention period longer - may be based on the cause of the safety risk increase or the popularity of artificial intelligence analysis, general surveillance video pre-approved is longer than the past.

In any case, we must anticipate the storage capacity requirements of the monitoring system before planning a video monitoring system or purchasing storage drives. You need to know: the number of cameras, video frames per second, 1 day of shooting, video retention time, resolution, video quality and compression method (MJEG, h.264, h.265). For example, 10 cameras shoot at 15 frames per second, 1080p resolution resolution, and 24 hours per day. If the retention period of video is 30 days, the storage space of video in MJPEG format is 100TB, h. 264 is about 5TB, and h. 265 is about 3TB.

The biggest difference between monitoring video hard disk and general desktop hard disk is the asymmetry of data reading and writing. The number of connected NVR cameras varies from several to dozens and the working hours are likely to be 7 days x24 hours. Therefore, the control firmware of the hard drive must be optimized to allocate the cache more efficiently so that video data from different cameras can be written to the hard drive quickly and unimpeded.

One more parameter to note is the "annual workload" - a typical read-write optimized monitor video hard drive can provide a workload of 180 terabytes per year. When purchasing a hard drive to monitor video storage, you must be aware of whether the storage storage is adequate, how many hd cameras can support, and whether the annual workload (TB/ year) can meet the demand.

Video monitoring disks are generally installed in slots in NCR/DVR, NAS, or external disk arrays. Due to the mechanical hard disk in the working state will produce a certain jitter, in the working environment of multiple hard disks these jitter will be superimposed and affect the accuracy of hard disk reading and writing. In severe cases, this can lead to errors in the data writing process or even corrupt the recorded data. As a result, video monitoring drives will have rotating vibration (RV) sensor technology to compensate for the vibration caused by adjacent drives or cooling fans.

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