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Four storage mode in video surveillance

A high-performance video surveillance system must have high-performance data storage system, which relates to the data management efficiency, data security and data utilization efficiency. But thus producing massive amounts of data is very alarming, as a mass storage support, often due to the storage system performance, price, compatibility and other factors become a problem plagued users. Currently monitoring market presence of four storage technology: Encoder direct-attached storage, dvr storage, nvr storage, centralized storage.
Codec plug-in storage device, via codec external memory interface, the main use sata, usb, iscsi nas and other storage protocol extensions. This way you can achieve further extend the capacity of the codec, suitable for small-scale deployments, surveillance video data through raid on the reliability of the technique must be guaranteed. Which direct connection sata / usb mode used, can not be shared and a lower expansion capability, the current application is gradually phased out; ip network (iscsi and nas) approach has better scalability and sharing capabilities. General network storage products and a number of mainstream manufacturers direct encoding device writes video data, reducing the server transfer this link, in performance and also saves the user's investment, but this approach because of the need to rely on the flow media server and retrieve forwarding data, forwarding streaming easily this link bottleneck, and is currently usually nas storage, due nas own file protocol, resulting in a multi-node concurrent write data is not efficient.
DVR storage is the most common type of storage mode, the codec device directly attached hard drive, with up to eight hard drives. However, due to limitations codec equipment performance, the general pattern of sequential writes hard, no application raid redundancy technology to achieve data protection. With growing hard drive capacity, single hard drive failure resulting in loss of critical data in a simultaneous increase in the odds and DVR performance limitations also affect the sharing and analysis of image data. Features of this approach are: cheap, easy to use, by remote control and keyboard can operate; DVR mode suitable for small-scale, distributed deployments.
In the video surveillance system, NVR is ideal for upgrading analog VCR and DVR replacement products, is based on the realization of the original exemption dvr Windows operating system and computer with a separate stand-alone operation of the device. Because NVR adopt highly integrated chip technology, advanced digital video recording, storage and playback capabilities, without having to change and store tapes, with and without a computer maintenance, therefore, can achieve high resolution (up to full-d1 resolution rate), high-quality real-time monitoring, and simple to use. In simple terms, NVR system of traditional video, audio and control signals are digitized, NVR via the network interface device, in the form of ip packets transmitted over the network, based on dvr, realization of the network system.
The front-end server connectivity codec download data via streaming protocols, and then stored on the storage device. You can connect via sas, iscsi, nas, fc protocol between servers and storage devices. Centralized storage platform is suitable for medium to large deployments. Centralized storage mode, ip connection mode (iscsi) and fc connection mode has good scalability and manageability, is currently in one more way. From a practical effect in terms of deployment and, fc storage due to the strong performance and data processing capabilities, more monitoring nodes environment is more appropriate; and ip storage performance and scalability due to limitations in small and medium sized applications can have more high price.

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