Storage development and common technologies: At the end of the 1990s, digital video monitoring based on digital signal processing (DSP) gradually became popular, and various codec technologies have been widely used in image processing. The processed images can also be streamed in digital code. Transmission, the storage of images has also begun to enter the digital period. The most typical application is a digital hard disk recorder (DVR), which uses an internal hard disk for image storage.
This storage method has fundamental changes in storage time, image retrieval, system maintenance, and remote recall. However, because most of the digital video surveillance systems at this stage have obvious localization characteristics and relatively small scale, storage also shows obvious front-end and stand-alone characteristics.
In recent years, with the rapid development of information network technology, networked video surveillance systems that are centrally managed and controlled through a central business platform, with network video servers and IPCamera as the front end, have begun to be widely deployed. Due to a reasonable architecture, flexible expansion, and clear layers, network video surveillance can bring users a new security application experience, thus quickly becoming the main form of building a new generation of video surveillance systems.
The distributed front-end and platform architecture, centralized management and control, and flexible and convenient user access have made the storage part of the network video surveillance system begin to be networked. Networked storage brings a new storage architecture to video surveillance. On the one hand, users are more flexible in storage deployment and access is simpler. On the other hand, it is also more convenient to build a video surveillance system that requires mass storage.
DVR storage: internal storage of the codec-DVR storage is the most common storage mode at present. The codec device is directly connected to the hard disk, and currently it can bring up to 8 hard disks. However, due to the limitation of the performance of the codec equipment, the sequential write mode of the hard disk is generally adopted, and RAID redundancy technology is not applied to achieve data protection. With the continuous increase of hard disk capacity, the probability of single-chip hard disk failure leading to the loss of critical data is increasing synchronously, and the limitations of DVR performance also affect the sharing and analysis of image data.
The characteristics of this method are: cheap, easy to use, can be operated through the remote control and keyboard; DVR mode is suitable for small-scale, distributed deployment. Domestic DVR products such as Haikang and Dahua's products are very mature.
Codec storage: Codec external storage device, connected through the codec's external storage interface, mainly uses SATA, USB, iSCSI and NAS storage protocol expansion.
In this way, the capacity of the codec can be further expanded, which is suitable for small and medium-scale deployments. The reliability of the surveillance video data is guaranteed by RAID technology. Among them, the direct connection mode adopted by the SATA / USB mode cannot be shared and has low expansion ability; the IP network (iSCSI and NAS) mode has better expansion ability and sharing ability. Haikang's DS series monitoring NAS storage products, and Bono Storage's SMI series storage products are all very mature in the monitoring industry.
Centralized storage: The server connects to the front-end codec, downloads the data through a streaming media protocol, and then stores it on the storage device. The server and storage device can be connected through SCSI, iSCSI, NAS, FC protocol. The centralized storage method is suitable for the deployment of large and medium-sized platforms.
In the centralized storage method, the IP connection mode (iSCSI, NAS) has good scalability and manageability, and has a high-performance price ratio.
Data recovery: The monitoring equipment is often initialized after connecting to an ordinary computer, but it cannot be played when it is connected to the monitoring machine again. If there is a problem, you can contact Guangzhou Tuofei Data Recovery Center to capture the video.
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