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New RAID Technology for HD Surveillance Big Data Storage

New RAID Technology for HD Surveillance Big Data Storage

With the popularization and application of the continuous development of information technology and security products and systems, security industry data security problems keep people's attention. With the rapid development of high-definition monitor, a large spread safe city, smart city and other large projects, increasing the amount of data, big data storage problems attendant brought under and data security, network video surveillance is becoming field of new issues.

Data storage security is accompanied by security technology and storage technology for common development. Has experience in the analog front end + DVR storage, analog front end + DVS / DVR + network storage, network front end + NVR, Network + front-end network storage phases. Now, with the increase of network bandwidth, so more and more common definition, and then stored on the security system put forward higher requirements.

First, the demand for new data storage security

Security features of today's development can be summarized as the following three points:

1) high-definition

High Line Simulation: 600/650/700 line high-resolution analog camera + DVR


HD network: 1.3MP / 2MP / 3MP / 4MP / 5MP IPC + HDVR + NVR, 4K Applications

2) Intelligent

Engaged Responsibility, passive transition to apply in advance prevention and control, active defense, further liberate manpower and improve efficiency

From the technical level with intelligent analysis into the actual application stage, such as perimeter protection, personnel tracking, etc., have begun to use in public security, transportation, financial, judicial and other industries

3) Fusion Applications

Fusion using a single phase system is independent from the use of multi-system into the platform, mainly for

Large-capacity video information collection, sharing

Internal Security systems integration, docking upper business management system

Multi-system integration, such as emergency response, emergency surveillance, public security and fire

A high degree of security and IT technology integration

According to the current needs of the new security system, security system, storage requirements can be summarized as follows.


Second, the security storage technology: the underlying security to protect data from

From the above analysis, security systems, has entered the stage of actual combat, and intelligence analysis, active defense, converged applications in actual combat operations must be based on reliable monitoring data storage system. Here are two safe storage RAID technology that can guarantee from the underlying data.

1, VRAID (VedioRAID) technology

RAID technology is already very familiar with, is based disk array technology, through continuous development, now has from RAID0 to RAID7 eight basic RAID levels and similar RAID10, RAID50 dimensional RAID. Different RAID levels provide the appropriate RAID performance and data security for users. But any kind of disk fault tolerance RAID technology has limits, that is, after a certain number of bad disk Number entire RAID group fails, in which all the data is lost. For example, in a traditional RAID5, when a hard drive is damaged, RAID redundancy mechanism to ensure through data is not lost, but when two or more hard disk is damaged, unfortunately, can not help you recover RAID5 hard drive data, in general, and you had all the data He said byebye it!

VRAID technique presented here is a new RAID technology for security applications (for video applications Hikvision introduced a new technology). After VRAID technology can effectively solve the traditional RAID multi (2 or more) hard disk is damaged, the data of the entire RAID group full loss problem. That VRAID in bad two or more disks (ideally as long as there is an available disk can be), the remaining good disk data can still be read, while the new data is written sustainable. Technical rationale: VRAID implementation is based on the underlying storage device differs from the traditional file system structure of streaming media data management and RAID optimization techniques. When the multi-block disk VRAID damage in streaming data management structure, good disk on each strip of the video data can still be standalone player; playing bad plate strips when to direct and natural playback skips to the next available strip data, to ensure smooth video playback screen. The new data transmission over the same time, you can still write.

2, Network RAID technology

Traditional RAID limited by the number of hard drives, can not meet the business needs of flexible deployment of resources in a unified data capacity surge era. Intelligent and efficient storage requirements of the development trend of the underlying data distribution architecture must have a high degree of flexibility and scalability, with the increase of the capacity of the hard disk to the hard disk in units of data management has become increasingly powerless. General disk array can only be done within the same physical node RAID, and a hard disk can only be located in a RAID group, when a controller is down or the disk is damaged, then you have all the data is lost, which is the traditional RAID disk array availability relatively large disadvantage.

Network RAID is a Scaleout technology, you can create RAID between different physical network node communication. And the basic unit of a RAID is no longer the entire hard drive, but each drive Chunk block, a hard disk can be in more than one RAID group. When a physical node goes down, the whole system data can be recovered by other physical nodes out; when a single disk failure, you can participate in the reconstruction of a plurality of disks, the reconstruction process can be completed within minutes level. Technical rationale:

1) all of the hard disk partition each physical node as Chunk block

2) Create a RAID-based hard disk Chunk blocks different physical nodes

It is based on the entire RAID to create Chunk, Chunk from different physical disk nodes. We can work together to build the entire RAID group composed of all physical nodes (one or more hard disks).

The first group RAID: 3 + 1--3 valid data, a parity data

The second group RAID: 3 + 2--3 valid data, two verification data

3) a single hard drive failure and treatment

A hard disk can be located in multiple RAID sets, so when a single disk is damaged, there will be multiple sets of RAID joint reconfigurable computing, the extreme case of all hard disk at the same time involved in reconfigurable computing, speed is significantly higher than when ordinary RAID, up to minutes even in seconds. 4) the entire physical node failure and Treatment

Suppose third device fails. Common RAID, the data of the whole equipment is missing.

Network RAID, RAID on each of the following figure. Only some Chunk each RAID group of data loss, by the RAID remaining data blocks can be completely restored.

3 + 1RAID3 + 2RAID

Although called Network RAID RAID, actually distributed storage technology.

Can solve common RAID under reconstruction for a long time, the administrative burden of multiple storage nodes when a large pile of applications, can not meet the demand for hot, node failure data loss problems, eliminate the risk of a greater system availability.

Network RAID, no longer as the entire disk management unit and check unit, disk staging (Chunk) management, decentralized, providing sophisticated management, high-level fault tolerance and high performance data recovery, providing high data storage reliability.

Network RAID, generally disk errors, you can rebuild completed at the second level; when a disk fails, the large number of disks involved in reconstruction and accelerate the reconstruction process several times; cross-node storage resource allocation and management simpler, more important is the whole when a node fails, it can ensure data is not lost. Highly fault-tolerant design, whether it is a bad disk or node replacement and expansion, and can cope with simple implementation, so as to enhance the overall continuous availability storage solutions.

Third, the future of data storage security

Development of the security must be stored in the joint development of the underlying technology, physical equipment, systems architecture, relying solely on any point can not meet demand.

For a typical large and small surveillance systems, video streaming without having to write storage server + storage architecture for the security of VRAID technology can both simplify system deployment, have fully protect the user's data security. And with the GB / T28181 standard implementation, using standard streaming protocol video stream write storage solutions will become increasingly favored by the market. For large monitoring system (tens of thousands of video tip), required to achieve PB-class storage capacity by stacking single and common file system is unable to provide security, to ensure efficient application, there must be virtualized, clustered and discrete storage s solution. For video security applications using cloud storage technology cloud computing concept, with the underlying network RAID technology provides virtualization, clustering, integrated and convenient cloud storage service for users.

Security Cloud Storage System features: 1) virtualization technology fully integrated storage capacity on demand and can flexibly adjust the size.

2) through the front end of the video stream protocol write cloud storage, saving the user investment.

3) the video stream by balancing algorithm discrete sections in response provide data cluster concurrent services.

4) the use of the underlying network RAID technology, multi-layered security to protect user data.

5) System-wide cluster mode, real-time traffic between devices to ensure load balancing, improve equipment utilization.

6) Global integration indexing technology to enhance query rate, reaching second response.

Security cloud storage solution to the current security industry has begun to face the management and application of mass data storage, and actually used by the user has made a very successful video business application experience. The next few years, and medium-sized projects in security, security of cloud storage will occupy the main position of the video surveillance storage solutions, I believe, the security of cloud storage is quickly developed into a video surveillance storage market mainstream solution, it will be the best choice Program.

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