【 Weak current College 】 how to buy high-quality video surveillance storage system

Video surveillance storage of basic types there are three ways you can select:
1 use hard drive built-in DVR and NVR or server. This still is by far the most common form of storage.

2 direct attached storage that is outside your DVR hard drive, NVR or server. NAS or SAN system provides greater scalability, flexibility and space.

3 centralized storage.

Video surveillance storage system purchase principle

Video surveillance system is a relatively unique system, the main requirements of large capacity and cost, otherwise there is no so much money to set up all over the city, even the national monitoring system. Therefore choosing a large capacity, low-cost IP storage is to monitor the characteristics of the system itself and demand, while maintaining the security of the system.

In accordance with the monitoring system configuration select storage capacity given the size of the storage capacity of the device, apart from the number with the camera, and video formats, bit rate, the number of days of storage. Storage system capacity calculated as follows: assuming that the video format to D1, bit rate is 2 MB/s-single video daily storage capacity: 1 * (2Mb/s * 3600s)/8bit * 24 = 21GB. single video storage capacity per month: 1 * (2Mb/s * 3600s)/8bit * 24 * 30 days = 648GB. the camera number, bitrate, storage time according to the actual situation to select.

Distributed and centralized storage choice

Centralized storage advantages and disadvantages is that physical media gallery layout; uploading the video stream to the Centre of the engine room environment demands high, asked the engine room space is big, heavy, air conditioning, etc. are all issues to consider.

Distribution store, centralized management of strengths and weaknesses is that physical media distribution to a different location; close to upload the video stream, the backbone bandwidth nothing; may use multiple sets of low-end, small-capacity storage device distribution arrangements, equipment prices and lower maintenance costs; the deployment of small capacity equipment distribution, low requirements to the engine room environment.

For urban monitoring system of monitoring data, whether in various regions, how concentrated a lot of time and a city Administrative Division, a city the size of the area and the available network conditions. Smaller cities, network conditions, the better, and easier implementation of centralized storage. On the contrary, the greater the need for distributed storage. If there are eight district in Beijing. Creation of video surveillance systems, can be set for each zone, and then aggregated to the Center, such as the emergency command center.

Video surveillance storage procurement issues since monitoring is a video application class, and other system different access features: streaming media on the storage device that a multi-channel video long time writing the same store, real-time multi-channel video access to the same file, the video access bandwidth constant stability require high bandwidth, 1/25 seconds, on average, longer video access, capacity requirements, storage scalability can be high. Video stored on the storage environment has no special requirements. Routinely monitoring system data are essentially temporary nature, more than online storage time (such as 7 days, 15 days, the individual will be required 30 days), you can delete, so monitoring system backups very often just to meet a month.

As a result of equipment selection, do not have to choose the maximum bandwidth, and to choose a bandwidth fluctuations of the smallest, most smooth curve. Due to the long-running, it is best to use the controller architecture of storage devices, do not select the PC architecture, select capacity can be expanded.

In addition, more than 100TB capacity, FC-sata equipment prices are not necessarily more expensive than the ISCSI device. FC supported disk number, support for iSCSI devices generally few in number, assuming the capacity requirements FC-sata 500tb, only need a can, and the iSCSI device requires a lot of that, only iSCSI devices controller sector costs is very large.

Video surveillance system first is a video application system, because the storage device you want to be able to provide stable bandwidth output to meet long video, reading, writing, and second, video monitoring system has to meet a large number of real-time data is written to the camera, and to meet a large number of surveillance-video playback needs, therefore, also consider storage system can provide sufficient IOPS performance.

As a result of video surveillance systems in general all over the city or even country, therefore the storage device should also consider whether you can achieve a physically dispersed, but the management and monitoring features can be unified.

Network video system storage choice video application system includes such as online video, IPTV, VOD and video surveillance. But because of a network video system general rate is relatively small, approximately 100Kb/S-200Kb/s or so, so the bandwidth requirements are relatively small. Need online play a lot of users, so in general the storage devices of high IOPS performance requirements, and General site room total bandwidth is generally 1-2Gb/s (actual available bandwidth), individual large site may reach 4-5Gb/s. can assigned to the network video board, and there's nearly 100-200MB/S, so for bandwidth in terms of General iSCSI storage and FC storage can be easily met, but if you use NAS storage, you need high-end products.

Although the use of high-end NAS device costs more, but the NAS itself provides a shared file system, network video management and sharing area has the advantage of natural to facilitate later video server quantity expansion and upgrade. ISCSI and FC device in the end due to the use of low-cost SATA disk IOPS new can generally 6w-10w around, and therefore cannot be used with large-scale network video system.

Recommended network video system selection is from the bandwidth and IOPS two aspects to consider, in bothMeet the situation, try to use NAS products. Large system recommended FC disk fibre facilities.

If the system has a good video management system and distributed software system, you can use small-capacity, high performance storage for online storage to users increase real-time access, then use a low-cost ISCSI or NAS device as the secondary storage.