For the monitored project, there are four parts to consider, namely the front-end system, the transmission system, the storage system and the display system. For the transmission system, we have mentioned it many times before, and the storage system is a very important part of the monitoring project. Many friends have also discussed it frequently, so today we will understand the comparison of the three commonly used storage methods.
IP-SAN, a SAN-based storage architecture based on IP Ethernet, uses the iSCSI protocol to transfer data and store it directly on an IP network. The iSCSI protocol transmits SCSI command packets in TCP/IP packets, which is SCSI over TCP/. IP.
IP SAN can also be regarded as a kind of SAN, except that the server and storage are interconnected through network switches. The performance is not the best, but it is not limited by distance. The ip storage application is very extensive, and it can also be used as a large-scale monitoring storage.
IP-SAN can divide storage devices into one or more volumes and export them to front-end application clients, which can perform new file system (formatting) operations on these volumes. The client computer accesses these volumes by device-level block access. IP-SAN writes/reads disks in parallel by dividing the data into multiple blocks. The characteristics of block-level access determine the high iSCSI data access. I/O performance and transmission are low latency.
Simply put, it is stored as a block, you can think of it as a hard disk with array function, in fact, disk array + hard disk.
We can look at the topology diagram:
Compared to nvr storage, ip-SAN is generally used with streaming servers.
The role of the streaming media server is to effectively solve the problem of repeated use of network bandwidth when multiple users access the same real-time video data at the same time, fully save network bandwidth resources, and effectively reduce the occurrence of network congestion, and need to have one in the networked monitoring center. flow media services.
â”ƒIP-SAN storage mode has the following characteristics:
1. The advantage of high bandwidth "block" level data transmission.
2, based on TCP / IP, IP network technology is mature, with all the advantages of TCP / IP, such as reliable transmission, routable, etc., reducing the complexity of configuration, maintenance, management.
3. The iSCSI storage network can be deployed through Ethernet, which is easy to deploy and has low cost.
4, easy to expand, when you need to increase storage space, you only need to increase the storage device to fully meet, high scalability.
5, data migration and remote mirroring is easy, as long as the network bandwidth is supported, there is basically no distance limitation, better support for backup and remote disaster recovery.
The CVR storage mode can support video streaming directly to the storage device through the encoder, eliminating the cost of the storage server, avoiding a single point of failure and performance bottleneck of the server, and ensuring high stability and high performance of the monitoring service.
CVR is a dedicated video storage device for security monitoring. CVR is a video stream on TCP/IP that is rewritten into a stream data structure and written directly to the disk, so the disk is not a file, no fragmentation.
The NVR is an abbreviation for (ie, network hard disk recorder). The most important function of the NVR is to receive the digital video code stream transmitted by the IPC (Network Camera) device through the network, and store and manage it, thereby realizing the distributed architecture advantage brought by the network. Simply put, with NVR, multiple network cameras can be viewed, viewed, played back, managed, and stored simultaneously. Get rid of the computer hardware, no longer need to face the tedious installation software.
There are also a small number of 128-way NVRs on the market, because the NVR is an x86 architecture storage + monitoring software, and he also has a disk array function.
NVR is mainly used in small and medium-sized monitoring solutions, but for large-scale monitoring applications, NVR's short board is bigger than his advantage, and there are many monitoring points, large code streams, high pressure, large capacity, etc., which will make it difficult to use. For large public monitoring, it is considered to be scalable and manageable, so IP SNA or CVR storage is adopted.
Comparison of three storage methods
1. Comparison of NVR and ip-san
NVR is mostly front-end deployment, edge storage nature. Ip-san belongs to the central computer room storage and is suitable for centralized or distributed centralized storage.
In the field of high-definition surveillance, IP-SAN is more focused on large-scale networked data storage in special industries. This technology not only has a strong centralized solution capability, but also has a corresponding performance in long-distance transmission and management.
Ip-san supports multiple RAID levels: 0, 1, 0+1, 3, 5. In most cases, Arena recommends RAID5 because RAID5 has a higher hard disk usage and is a more secure RAID level. In addition to the protection on the RAID level, multiple global hot spare disks can be provided. Once any disk in the array has a problem, the global hot spare disk will work immediately to protect the data.
2. Comparison of ip-san and CVR
The CVR front-end is directly written to the storage by the streaming media protocol. The CVR does not need to be mounted on the network, and the CVR actively takes the flow. In the IPSAN mode, each front-end mounts an independent iSCSI storage space, which is uniformly allocated by the management server.
Dependency: CVR does not depend on any intermediate links, and IPSAN relies on intermediate management servers.
Adaptability: In the case of poor CVR network, only need to try to establish a session connection. The reconnection process takes a short time; IPSAN is poor in the network and the connection is interrupted. The front end and the storage must constantly try to remount. Connected, time consuming and easy to lose video.
Applicability: IPSAN can be used not only for security monitoring, but also for applications where IPSAN is used for storage in the computer field. CVR is a dedicated video storage device for security monitoring.
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