What is the SAN storage architecture?

[ Huaqiang Security Network News ] According to statistics, the front-end equipment of the monitoring system of the Expo site now uses more than 300 HD channels. The storage and storage method of video recording files adopts the method of external IPSAN of the DVR. The storage time is about two weeks. Above, the total storage capacity demand is around 100TB.
The video surveillance storage device provides video surveillance video storage space to all video encoding devices, including video servers (NVS) and network hard disk recorders, over an IP network. Other servers or monitoring devices can read video surveillance recordings directly from the disk array or read video surveillance recordings through video encoding devices.
SAN storage
Program advantages:
1. Make full use of the advantages of the network, flexibly deploy storage devices, and authorize users to limit the protection of access to stored video data, which is beneficial to external control.
2. Data flexible call, seamless support for video surveillance data integrated application platform, is conducive to the expansion of monitoring system functions.
3. Network storage solution, easy to use, affordable, with a complete and independent configuration wizard interface, simple and easy to complete system configuration. It also helps reduce costs and complexity for monitoring storage environments where data is growing rapidly.
4. Large capacity, low cost, a storage system can save 300 channels of video for up to 30 days. Regardless of storage performance, capacity, reliability and availability, it is well suited for video surveillance storage needs in critical areas.
5. Compatible with various video encoding devices, supporting video encoding devices of most mainstream video surveillance equipment manufacturers, including NVS, DVR and PC-DVR.
6. Professional and reliable storage devices, and optimized for IO, management and other aspects of video surveillance storage. Supports Raid0/1/5/6/10/50 and other Raid level settings, supports network redundancy, supports hardware redundancy such as power supply and fan, supports network fault recovery and system image backup, and other enhanced data security and reliability. Sexual technical means and excellent defense against virus infringement.
Video surveillance video data storage technology Security industry has made great progress in China, "Safe City", "3111 Project", "Global Eye", and other major projects; video surveillance in transportation, food, customs, energy, finance Widely used in the fields of national defense and other fields, the market prospects are quite promising. As an important part of network digital video, storage system often has many problems such as disk loss and volume lock in actual applications, which seriously affects the normal use of the overall monitoring system. Therefore, dedicated storage of video data has become One of the most concerned security products on the market. In the current digital video field, the most commonly used are the following four storage methods: hard disk, DAS, NAS, SAN. These methods have their own shortcomings.
The hard disk DVR, the DVS rear-mounted hard disk, or the way directly connected to the expansion cabinet behind the server are all stored by the hard disk. It should be said that the storage using the hard disk does not count as a storage system in a strict sense. The reasons for this include the following:
First of all, the hard disk generally does not have a RAID system, and the data on the hard disk is not redundantly protected, even if it is implemented by a RAID card or a soft RAID on the host side. Seriously affect overall performance;
Second, the scalability is extremely limited and data storage cannot be achieved.
Moreover, the maintenance cost of the hard disk is relatively high, especially in the way of hanging the hard disk after the DVS, and the maintenance cost often exceeds the purchase cost within one year. It should be said that the hard disk storage method is not suitable for the application of large digital video surveillance systems. In particular, digital video surveillance systems that require long-term recording. Generally, this method is coexisting with other storage methods in the same system as a buffer or emergency replacement for other storage methods.
Direc (DirectAttachedStorage), which is called direct connection additional storage, can realize the capacity expansion of the platform in a simple way by using DAS, and can provide multiple RAlD level protection for data.
The DAS direct-attached storage adopts the DAS mode to deploy related HBA cards on the video storage unit. Used to establish a data channel with the storage device on the back end. The video storage unit of the front end can be a DVR or a video storage server. The channel can be fiber optic, IP cable, SAS cable or even USB. The DAS method cannot support many video storage service units to access at the same time, and its capacity expansion depends heavily on the capacity expansion capacity of the selected storage device. Therefore, in a large-scale digital video surveillance system, the application of DAS storage mode will greatly increase the difficulty of system maintenance. Due to these characteristics of DAS storage, this storage method is generally applied to the expansion of DVR or small digital video surveillance projects.
NAS Network Attached Storage NAS (NetworkAttachedStorage). Fully known as network attached storage, it is a professional network file storage and file backup device. At the same time, NAS can provide multiple RAID levels of protection for data. The NAS device and multiple video storage service units are connected through an IP network, communicate according to the TCP/IP protocol, and perform data transmission by file I/O (input/output). A NAS unit includes a core processor, a file service management tool, and one or more hard drives for data storage.
The NAS method can simultaneously support multiple host terminals to read and write at the same time, and has excellent sharing performance and expansion capability. At the same time, the NAS can be applied in a complex network environment. Deployment is also very flexible.
However, since the NAS uses the CIF/NFS protocol for file-level data transfer, the network overhead is very large, especially when the data is written, the bandwidth utilization is generally only 20%. Therefore, NAS is currently used in small-scale network digital video surveillance systems or just for shared storage of partial data.
A storage area network (SAN) is a high-speed dedicated subnet that connects a disk array to a related server through a connection device such as a switch. At the same time, SAN can provide multiple RAID levels of protection for data. The SAN provides a dedicated, highly reliable storage network. Allowing them to increase their storage capacity independently also simplifies management and centralized control. Because of these characteristics, the SAN architecture is particularly suitable for storage applications of large-scale network digital video surveillance systems, and can handle the storage of thousands or tens of thousands of front-end monitoring points. Currently SAN is mainly divided into FC-SAN (Fiber Storage Area Network) and IP-SAN (Ethernet Storage Area Network). The difference between them is the difference between connecting lines and using data transfer protocols. Although FC-SAN can ensure more stable and efficient transmission due to the use of a dedicated protocol, its deployment method and construction cost are much higher than IP-SAN. Therefore, more IP is currently used in large-scale network digital video surveillance systems. -SAN architecture.
The Expo National Stadium adopts a SAN storage architecture for IP networks, which is fully compatible with direct video entry of front-end network digital products. For the special industry model of video surveillance, optimized at the system platform level, the front-end digital encoding device directly writes the digitized video data into the IP-SAN device. Make full use of the system architecture, effectively reduce the number of devices, reduce the management difficulty, maintenance intensity, and energy consumption of the overall system.

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