Analysis of storage product application status in security video surveillance field
First, the concept of disk array
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To define the concept of a disk array is a simple task, because the concept has formed a consensus - DiskArray is a hard disk controller to control the interconnection of multiple hard disks, so that the read and write synchronization of multiple hard disks Technology that reduces errors and increases efficiency and reliability. Disk arrays are a highly specialized and highly reliable product.
However, it will be difficult to define a professional disk array product. In the 1990s, when it comes to disk arrays, peers can accurately define what DiskArray is. There is no professional and unprofessional problem, because DiskArray itself represents a professional and special product. However, since iSCSI, SATA, SAS and other technologies have been implemented, the threshold for implementing basic functions of disk arrays has been reduced. With the widespread use of Linux and the mature development of technologies such as raid, iSCSI, NFS, and SAMBA in Linux environments, disk arrays have been further developed. The product is more intimate, and a large number of disk array manufacturers have emerged, which has affected the degree of specialization of the disk array. Products modified with PC servers can provide disk array functions, and the disk array of the PC server architecture lowers the price of the product, but the reliability will not be guaranteed.
So, what is a professional disk array? Professional disk arrays have the following landmark features: (1) modular design, including cooling system, power supply system, data processing core system; (2) controller architecture can provide redundancy (3) with disaster recovery technology such as snapshot, volume mirroring, remote replication; (4) using independent hardware chips to solve raid computing problems; (5) using high-performance cache technology, with cache mirroring.
Second, the development of disk array and video surveillance market
When it comes to disk arrays, we will definitely think of these concepts: DASNASSAN, these products have been matured and applied in various industries for many years, and have been used in the security monitoring industry for quite some time.
From the perspective of the development of the entire industry, the choice of high-reliability and stable storage devices is a problem that every solution user and every solution designer must consider. It is also a success or failure of a solution. The key factor.
Recently, the disk arrays that are most exposed by practitioners in the industry are generally IPSAN devices. As the technology develops, the technical threshold for implementing IPSAN is decreasing, resulting in many low-end entry-level products flooding the entire market, and the real professional products are not in the industry due to price factors or unfamiliarity and disregard of the security market. Well known to people.
So, how to choose the products that meet the requirements from the mixed brands? In fact, in the field of data storage, the controller architecture products are very mature and stable, but they are not well known in the field of security monitoring. The controller architecture products meet the requirements of data preservation for security, stability, and reliability. This direction is selected, and then combined with the brand, price, etc.
Professional disk array manufacturers will encounter difficulties in cutting into the security market. The first is the unfamiliarity of industry applications. If you only sell equipment separately, I think it is not very attractive to customers. The professional business of professional disk array manufacturers is not in the security market. The understanding of security is not deep enough, so it is unlikely that they will directly enter the market. Second, the price dilemma. In the security market, the budget is still relatively tight, and most of them have to be invested in the front-end construction. In addition to the lack of attention to data security, the storage equipment procurement budget is seriously insufficient to purchase high-end professional products. Therefore, it is foreseeable that, from now on, the probability of frequent occurrence of medium and high-end professional storage brands in security monitoring projects is not large.
This kind of status quo is a good opportunity for the practitioners in the security industry, whether it is from the trend of technology development, from the stimulation of market demand, or from the integrity and reliability of the overall solution. , should guide customers to choose stable and reliable products.
Take Dahua as an example. In 2012, a series of highly reliable professional disk arrays will be launched. The controller architecture will ensure the stable operation of the equipment from the overall structure and provide reliable guarantee for customer data security.
Disk arrays address not only storage space issues, but also the security of stored data. Nowadays, many entry-level low-end products on the market adopt PC server architecture and general industrial control chassis. They use the Linux open source raid management software and iSCSItarget to solve the basic “storage†function, and the price is also very advantageous, but the drawbacks are obvious. Failure recovery will be powerless. With this solution, post-maintenance will bring a lot of confusion to customers: Can these disk arrays run stably?
Professional disk array products guarantee the security of stored data in many ways. First of all, it must be a device with no single point of failure. It must be a device with no internal cable connection. It must be a modular design device, thus ensuring the stability and reliability of the device from the hardware. Secondly, it must implement internal data channel multi-path switching and load balancing. It must support external data channel multi-path switching and link aggregation functions. It must support advanced backup functions such as snapshot, volume mirroring, data migration, and remote replication. Software features can be used to protect user data from high availability.
At present, most professional disk array products, from the usage rate, the average annual downtime will not exceed 0.05%, which is 99.95% annual reliability rate, converted, the annual downtime is no more than 5 hours, and Some high-end products achieve an annual usage rate of 99.99%, and the annual average downtime will not exceed 57 minutes.
Third, several professional storage solutions
In the field of professional storage products, we can't talk about DVR and NVR storage methods in the monitoring field, because they are not a conceptual thing at all, but in the security field, they and NASDASSAN and other projects for different projects, to bring different choices to customers. .
Next, for the different monitoring systems, we will subdivide the best application solutions in various systems.
1. Small monitoring system
The small monitoring system mainly uses analog cameras + embedded DVR devices or NVR + IPC devices to build monitoring applications such as residential areas and campuses. In these environments, we can use data-saving and stable devices for data storage protection. In general, in these applications, embedded DVRs and NVRs can use their own multiple hard disks for data storage. In this case, the number of monitoring points is generally within 50 points, and the storage capacity of the embedded DVR itself can fully meet the needs of the application.
2. Medium-sized application monitoring system
In this type of application, the number of monitoring points generally reaches about 500 points, and the storage time is long. Usually, a real-time 24-hour recording strategy is also adopted, so that a large amount of data is generated, and storage requirements are relatively high, and data is relatively high. Further improvement in control, management and other requirements. In this application environment, we generally recommend using IPSAN with encoding device + video integrated platform for data storage. This has the advantage that users can manage devices uniformly, centrally store data, manageability and data security. Greatly improved. In this solution, the storage space required for data is considerable. How to effectively store data, how to ensure that these data are not lost safely and reliably? Choosing a stable and reliable product will reduce unnecessary maintenance for post-maintenance work. trouble.
3. Large-scale application monitoring system
In general, large-scale monitoring systems can reach more than 1,000 points. The most typical case is Safe City. The biggest feature of this type of application is that the system is large, complex, and has a large amount of data. Most of them will adopt the strategy of tiered storage and central centralized backup. The performance and stability requirements of data storage devices are more strict, and the security of the monitoring center is more secure. Concerned, therefore, there will be the characteristics of coexistence of IPSAN and FCSAN.
As the first-level storage, IPSAN will bear all the storage pressure of each sub-control center, and upload important data to the upper-level data center for backup. The requirements for products should not only consider stable and reliable security. There is also a high demand for the ability to read and write products. As a storage device of a sub-center, it may be necessary to consider the overall cost. Compared with other network storage products, IPSAN is the best choice for this kind of occasion. It can meet the requirements of the branch center in terms of cost performance and equipment adaptability.
The FCSAN is selected as the storage device of the primary data center. It considers that the device can provide more reliable quality of service and better delay characteristics of the fiber link, and solve the network bottleneck caused by large data throughput.
Fourth, the analysis of the application status of storage products in the security video field
With the rapid development of the security industry, people are paying more and more attention to the storage and security of data. Compared with financial data storage, medical center data storage, Internet center business data storage and other fields, the security market is not at the forefront of all data security considerations. Many projects only require storage and basic security. It does not consider the subsequent requirements of fault recovery, data backup, etc. Once a failure occurs, it is extremely difficult to ensure data security. However, with the development of high-definition video technology and the overall cost of high-definition projects, HD applications are becoming more and more widespread, and people will inevitably pay attention to data security. Previous video materials Due to video quality issues, most of these video materials are only a reference for after-the-fact forensics, not necessarily required, plus the industry's high cost requirements for project construction, directly leading to the application of the entire security monitoring industry. Centralized storage devices are relatively low-end. Pursue price, do not pay attention to equipment stability; only pay attention to storage space, do not pay attention to equipment grade. These have caused the low-end requirements of the security video surveillance industry for data storage devices. It can be said that the security and stability requirements of the security monitoring industry are at the end of the entire storage industry. The arrival of the HD era will completely change this pattern. Because HD video can see more details and cover a wider space, it can better support video intelligent analysis technology for later mining work, which means that the reference value of video data is greatly improved, from a dispensable The status is directly raised to the important position that must be referenced. As the importance of data increases, data security will certainly increase several levels.
V. Conclusion
In recent years, security video surveillance technology is constantly seeking breakthroughs, not only the upgrading of technology itself, but also constantly seeking to introduce mature technologies from other industries. In the security video surveillance industry, we have recently seen references to HD-SDI technology in the broadcasting industry. Going forward, we have expanded our business to Ethernet, enabling centralized monitoring, networked applications, and more. All of these prove that as long as there is application demand, we can learn from and digest advanced technologies from other industries and improve the overall solution.
At present, the security and reliability of storage devices have become a common concern in the industry. Therefore, we can fully introduce the mature technology of the data professional storage industry, learn from their advanced concepts, improve the problems of centralized storage in the security video surveillance solution, and even optimize the video recording industry data reading and writing. Professional products that meet industry applications.
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