Security industry storage equipment who led the coquettish

With the popularization of digital security technology, the storage equipment in the security industry has gradually moved from the marginalized position of the monitoring system to the center, and the proportion of the monitoring system has also been greatly improved with the increase of the centralization. However, the non-standardized nature of the security market has determined the diversity of features stored in the surveillance area. This is not unlike the IT market, SAN storage, or the NAS storage in the file sharing field. Security industry storage options are more like a flower show, and each product is desperately competing.

In general, the following storage technologies exist in the current surveillance market:

1, DVR storage. DVR storage is currently the most common storage mode. The codec device directly connects the hard disk. Currently, up to 8 hard disks are available. However, due to the performance limitations of the codec equipment, the hard disk sequential write mode is generally adopted, and RAID redundancy technology is not used to implement data protection. With the continuous increase in the capacity of hard disks, the probability of failure of key data due to the failure of a single hard disk is increasing at the same time, 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 by remote control and keyboard; DVR is suitable for small-scale, distributed deployment. Domestic DVR products such as Haikang, Dahua's products are already very mature.

2. The encoder is directly connected to the storage. The codec external storage device is connected through the external storage interface of the codec, and mainly uses storage protocols such as SATA, USB, iSCSI, and NAS. In this way, the re-expansion of the codec capacity can be achieved, which is suitable for small-to-medium-scale deployments. Monitoring video data is assured in terms of reliability through RAID technology. The direct connection mode adopted by the SATA/USB mode cannot be shared and the expansion capability is low. The current application is gradually being eliminated; the IP network (iSCSI and NAS) mode has better scalability and sharing capabilities. For example, Inspur's series of network storage products can directly write video data to several mainstream manufacturers' encoding devices, reducing the number of server relays and saving users' investment while improving performance. Rely on the streaming media server for data forwarding and retrieval, and it is easy to have bottleneck in streaming media forwarding. At present, direct write usually uses NAS storage. Due to the NAS's own file protocol, etc., data is written concurrently in multiple nodes. The efficiency is not high.

3, centralized storage. The server connects to the front-end codec, downloads the data through the streaming media protocol, and stores it on the storage device. Servers and storage devices can be connected through SAS, iSCSI, NAS, and FC protocols. The centralized storage method is suitable for the deployment of large and medium-sized platforms. Among the centralized storage methods, the IP connectivity mode (iSCSI) and the FC connection mode have good scalability and manageability, and are currently one of the most widely adopted methods. From the perspective of actual deployment and effect, FC storage is more suitable in the monitoring environment with more nodes because of its powerful performance and data processing capabilities. IP storage can be implemented in small and medium-sized applications due to limitations in performance and scalability. High cost performance.

4, NVR storage. In the video surveillance system, NVR is an ideal upgrade product for analog video recorders and hard disk video recorders. It is a stand-alone operation device that is based on the original DVR and eliminates the need for Windows operating systems and computers to work together. Because NVR adopts highly integrated chip technology, it possesses advanced digital video recording, storage and replay functions, no need to replace and store video tapes, and does not require computer coordination and routine maintenance. Therefore, it can achieve high resolution (full-D1 resolution can be achieved). Rate), high quality real-time monitoring, and easy to use. In simple terms, the NVR system digitizes traditional video, audio, and control signals, and transmits them on the network in the form of IP packets through the network interface on the NVR device. On the basis of the DVR, the system is networked.

In the application, although the NVR system has the advantages of computer's fast processing capability, digital information anti-jamming capability, convenience of quick query recording, clear video images, and multiple display of stand-alone images. However, in essence, NVR not only fails to solve the problem of analog transmission existing in DVR system, but also does not solve the more management problems brought by network transmission of video stream. In fact, each NVR forms an independent monitoring center, which brings more complexity to the realization of the whole network monitoring. In areas such as remote control, multi-level scalability, and networking capabilities, there is still room for improvement.

The above methods are more than a few types in current monitoring applications, and they all play an irreplaceable role in their respective applications. Which type of storage technology will lead the trend in the future and occupy a stronger market?

If you do not want to look forward to predicting which mode of monitoring storage will be adopted after a certain number of years, the specific answer is more difficult to answer. After all, the rapid changes in technology make us even harder to learn, let alone forecast which technology can occupy more. The upper hand of the market. However, the ever-changing nature of any technology or product is inextricably linked with its application and its perfect solution to user problems. Therefore, before we predict, we must first understand the need of storage for monitoring applications. What is it?

What is the need for monitoring storage applications? First, the need for mass storage. The monitoring data is written in 7×24 hours, and the storage time is from 7 days, 15 days... Even to 1 year. The data volume increases linearly with time. For a safe city project, the total number of monitored routes is usually several thousand to tens of thousands of roads. Thousands of terabytes of projects are common, which is unimaginable for the traditional storage industry.

Second, performance requirements. Video surveillance is primarily the writing of video streams, and the performance of the representation is the number of streams that the storage can support (usually 384Kbps-2Mbps). In the case of multi-channel concurrent writes, there is a large impact on bandwidth, data capacity, cache, etc., and there is a great deal of pressure on storage. At this time, storage needs to be optimized for video performance.

Third, price sensitivity. Security monitoring industry's mass storage, due to the large total capacity, caused an increase in the total price cost. Conversely, the demand for unit capacity costs (per TB price) is high;

Fourth, centralized management requirements. In the security monitoring application, since a large amount of storage devices and massive data in the storage devices are needed, they must be managed effectively and provide convenient, reliable, and transparent support for the use of end users.

Finally, networking requirements. TCP/IP network is the network foundation for the development of security monitoring technology in the direction of networking. Storage technology based on TCP/IP network will play an irreplaceable role in the process of network security monitoring and control.