Storage devices are an integral part of video surveillance systems. The storage device used in the video surveillance system has different characteristics from other types of systems in terms of data reading and writing.
Features one:
A digital video encoder or video server writes data into a storage device in a streaming media manner, and real-time monitoring of point-backed images and pictures is stored in a storage medium in streaming media. The playback workstation reads the stored video files in streaming media. . This read and write method is completely different from the small data blocks or file level read and write methods used in the storage of common database systems or file server systems. Therefore, the video monitoring system is different from other application systems in storing technical parameters.
Feature 2:
There are often 1000-2000 or even more surveillance cameras in large-scale video surveillance systems. Each camera generally uses D1 format to transmit images back. The code rate of each D1 image is 2 Mb/s, and all the cameras have accumulated a total of 200-380 MB/s of bandwidth. In the video capture process, the video file format generally does not change, and the code rate is kept constant. The frame rate of the video image is generally between 15-25 frames/s, which means that in the storage read-write operation, it must be Ensure that the bandwidth of 200-380MB/S can be achieved every 1/25th of a second. Otherwise, frame dropping may occur during image acquisition or playback unless the storage device itself is configured with a large-capacity cache. Therefore, video surveillance system storage not only requires a large bandwidth, but also requires a constant bandwidth.
Feature 3:
Data read and write operations last long. Since the cameras are generally working in 7*24 hours, even if the stream media files are stored in segments, the duration of the write operation may be as long as 2-6 hours, and the same time is required for the latter playback. Therefore, it is required that the storage has a superior long-time working ability and maintain long-term stability.
Feature 4:
Video surveillance systems generally have a large number of cameras and long video image storage time. Therefore, the storage capacity needs are huge. With the increase of image storage time, the storage capacity needs to grow linearly and explosively. Therefore, video surveillance system storage must support large capacity, and the capacity has high scalability to meet the needs of long-term large-capacity video image storage.
When people refer to security network applications, most of them think of network surveillance cameras. In fact, the composition of the monitoring system is not limited to front-end products. If there is no back-end storage device, the huge image data can only become "clouds."
There are 10 technologies related to network storage:
NAS systems: Network attached storage systems, file storage and access all need to go through the LAN, and also support the addition of extra storage over Fibre Channel or SCSI-based switches.
NAS Gateway: A diskless file server that uses a SAN storage array to provide expanded storage capacity.
SAN architecture: Multiple servers in the network are connected to a central disk repository consisting of one or more storage arrays, greatly improving system management and data backup.
Cloud storage: Through clustering applications, grid technologies, or distributed file systems, a large number of different types of storage devices in the network are brought together through application software and work together to provide external data storage and service access functions.
HBA: A pluggable card that connects a host computer to a network/storage device and supports multiple storage network protocols.
IP Storage: Use the IP protocol to connect to a remote SAN. In a Fibre Channel SAN, the IP protocol is used to send FC frames in IP packets. For non-Fibre Channel SANs, the iSCSI protocol is used to convert SCSI data to IP packets.
RAID: An independent redundant disk array that requires multiple disks to improve performance and redundancy.
LANfree backup: Does not go through a LAN or WAN network when backing up data to a storage array, tape library, or other storage device.
Fibre Channel: Data requests are transferred from the server to the disk array, and Fibre Channel switches in the SAN are used to connect servers and storage arrays.
Block-level storage: Block-level access ensures that network users do not have to manage data when reading/copying files from/to disk, allowing network administrators to specify where data is stored to address performance issues.
How to encrypt the monitored storage video?
Estimation is not possible through the installation of tripartite data encryption software, which can result in video anomalies. Do not know what monitoring software you are using, can not be realized I am not sure. But you can try the following methods to meet your requirements.
The first step: monitoring the software operation usually requires the user name and password login to operate, you can set a password in the software super user, and then create a new limited user, do not assign "playback video" and "close the system" Give it permission. Then use this user who does not have playback rights to log in to the software. Although the above settings limit the user's permission to playback or shut down the software, there is still a possibility: Minimize the software or go back to the WINDOWS desktop through other methods, and then enter the video through the “My Computer†Hard disk partition directly click on the video file to play.
The second step: see if there is such a setting in the software: whether to lock the CTRL, ALT, DEL and WINDOWS micro-keys of the keyboard (the key between CTRL and ALT). To put it plainly, the user is not allowed to use the micro-key to call up the "Start" menu so that he cannot enter "My Computer". Disable the CTRL+ALT+DEL key combination to prohibit running the "Task Manager", so you can not force the end of monitoring software by ending the process. It is possible that there are no related setting options in the software, but the above keys have been automatically locked when the software is running. This step is the most critical. If the monitoring software does not support locking the above-mentioned keys, it is a pity that there is no way to protect the video. I don't know if there is a three-party software that locks the keyboard. If so, the problem can still be solved. If not, it would be without the keyboard.
The third step: set the monitoring software to start automatically. That is, the system automatically runs the monitoring system upon startup. Then disable the USB connector in the BIOS Setup and set a password for the BIOS. Because the Windows system may automatically open a dialog box when a USB device is inserted while the system is running, it is very possible to access any disk partition of the computer through this dialog box. Of course, the above-mentioned method is not difficult for a knowledgeable person to crack. Surveillance System As a special software, developers often consider these functional requirements mentioned above when designing. Although the settings for the various settings in the software are not the same, the functions should all be similar.
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