UIT Enterprise Large Centralized storage solution

After the 911 events of 2001, China's security market has been developing rapidly. In recent years, with the Beijing Olympic Games approaching, there have been many major Olympic security projects. In the rapid development of China's security market, the emergence of some emerging equipment manufacturers, uit as a professional storage vendors, quickly in the security storage market occupies a place.

Now we talk about more ' safe city ', ' Global eye ', ' Wide World ' and other items become the main topic of the market, however, security market application of the earliest, most sophisticated airport, financial and other industries monitoring storage still need our attention. In the airport, Treasury, Arsenal and other projects, its application characteristics determine the storage equipment selection, these characteristics are as follows:

1, the total number of front-end monitoring is not much, but the monitoring range is relatively concentrated. This type of application, the number of cameras in general hundreds of to about thousands, the scope of monitoring is mainly the scope of the jurisdiction, relatively concentrated.

2, the storage time is long, the storage capacity is big. Important site monitoring images, many of which require storage for several months or more than a year, which requires a very large store capacity, typically in hundreds of TB or thousands of TB.

3, stable equipment, high safety. Storage devices require an IO request for a long time, requiring the device to be able to operate stably for long periods, because of the high security requirements for such applications, the storage devices will require full redundancy design and have a variety of security protection measures.

4. Advanced system and good expansibility. In the design of the storage system, it is necessary to ensure that the system in a few years to meet the application needs, will not be eliminated soon; because the number of front-end increments every year, so storage devices to have a good scalability, can facilitate the storage of new equipment image information.

5, high cost performance. From the original to DVR as the core of the transition to professional storage equipment as the core, customers need to gradually adapt, so in terms of cost-effective, can not be too different from the original way.

1. Storage System Network Architecture

When designing the storage of video surveillance system, we should first clarify two concepts, one is network architecture, the other is storage type. The network architecture is mainly refers to the storage device and the server or the workstation connection way, the data reads and writes the way and the sharing way. The mainstream storage-system network architecture includes Das, NAS, San Three network architectures, in which the SAN network environment is divided into FC Sans (Fibre Channel storage products) and IP sans (iSCSI storage devices) due to different storage device types. A storage type is a storage device that is divided into SCSI disk arrays, FC disk arrays, and iSCSI disk arrays, depending on the type of interface, transport protocol, and network device of the storage device.

*das

DAS (direct attached Storage) refers to connecting a storage device directly to a computer through a SCSI interface, iSCSI interface, or Fibre Channel. In this network architecture, storage devices are generally directly connected to the back of the server and stored. Because the number of host ports in the storage device is only, the DAS schema is typically used in systems with fewer servers, SCSI disk arrays when fewer than 2 servers, and iSCSI disk arrays when the number of servers is less than 4, and when fewer than 8 servers are available, FC Fibre Channel disk arrays can be used.

*nas

NAS (Network attached Storage, network-attached storage) connects a storage device to a group of computers through a standard network topology, such as Ethernet. Many people see NAS, SCSI, and FC Fibre Channel storage as a type of storage device, and in fact NAS is more a network architecture, meaning that storage devices provide data storage access to servers or workstations on the network through network sharing. The convenience of NAS is embodied in this shared network architecture.

The so-called "NAS storage" is generally composed of a "NAS Server + Storage" community, together provide data read-write access services for business application-side servers on the system, in small "NAS storage", where storage devices and NAS servers are integrated into one chassis, called Integrated NAS. In medium and large NAS storage, storage devices are typically separate from NAS servers, which can be either a SCSI disk array, a Fibre Channel disk array, or an iSCSI disk array.

In the NAS architecture environment, the storage is generally through the NAS server for the network environment of the application services, the server and workstations in the system are not limited in number, can be easily applied to small-scale systems or large-scale video surveillance system.

So as long as bandwidth and IOPS performance are met, the NAS architecture can be used in a variety of server-number video surveillance systems. However, because the bandwidth of NAS storage is generally relatively low,

*san

Sans (Storage area Storage, storage areas), in the purest sense, are a separate computer network characterized by cables, switches, and hubs based on Fibre Channel technology (Fibre Channel) or iSCSI technology that connect a large number of storage devices, It is connected to a network of many different servers and is managed in a more point-to-point manner. Generally, the different types of storage devices used in San networks can be divided into FC Sans (Fibre Channel storage products) and IP sans (with iSCSI storage devices). Sans enable storage devices to be truly disconnected from the server, forming a total data center and connecting to other computers on the network in a more point-to-point manner. Sans are connected in a way that enhances connectivity and has better fault tolerance than traditional approaches. Sans can also improve availability and operational continuity to a new level by adopting advanced clustering technologies. A comparative analysis of DAS, NAS, and SAN Network architectures in the context of video surveillance systems:

Here we can use a simple table to represent the key technical differences between NAS and SAN: