Storage form of video data
The main forms of storage in video surveillance storage include DVR NVR IPSAN.
After video surveillance enters the digital age, the most typical storage application is the digital hard disk recorder DVR, which uses an internal hard disk for image storage. DVR storage once occupied more than 90% of the video surveillance storage share. The advantage is that the price is cheap. The technology is mature and easy to use. It can be operated by remote control and keyboard to realize plug and play.
With the expansion of monitoring scale, the extended storage mode has emerged in DVR mode, mainly using storage protocols such as eSATA USB. It is suitable for small and medium-sized deployment. Monitoring video data is obtained through RAID independent redundant disk array technology. Certainly guaranteed. However, this mode is generally directly connected, cannot be shared, and has low expansion capability, and is still not suitable for large-scale data storage.
With the popularity of networking, DVRs have evolved into small NVRs and hybrid DVRs that can support analog IP cameras. However, due to its poor reliability and sharing, DVRs are limited by capacity and performance, and have limited number of connected cameras. Therefore, they are widely used in small-scale distributed systems for local and stand-alone storage.
IPSAN NAS network storage
After video surveillance entered the era of networking, network storage played an increasingly important role. In the medium-sized video surveillance project, with the increase in the number of monitoring front-ends, especially the large-scale use of high-definition camera front ends, the storage capacity has increased dramatically, and the number of storage devices has increased rapidly.
Centralized management and control through the central service platform Network video server and IP camera as the front end Networked video surveillance system with IPSAN NAS network storage as the back end is widely deployed.
Network camera or video encoder
After the captured video is encoded and compressed, the surveillance camera is uploaded to the central platform video server. When the scale is large, there is a sub-center platform. The video server processes the video packet and sends it to the IPSAN NAS for storage. When the client or the video wall wants to access the playback related video resources, all video streams are forwarded through the video server via the process of storing the video server client or the video wall.
Compared with the previous DVR storage, IPSAN NAS storage has more advantages, higher capacity, higher performance, more supported cameras, RAID technology and redundant design, high reliability, unified space management, convenient sharing, strong expansion capability, and upgrade. Convenient and flexible to deploy.
Due to the reasonable expansion of the architecture and the clear and flexible level, the network video surveillance system based on IPSAN NAS has become the main form of current video surveillance system. It is widely used in the environment of large-scale access and large-capacity centralized storage of front-end equipment such as Safe City. .