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We have previously published a number of monitoring projects. For the monitored projects, 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. The storage system is a very important part of the monitoring project. Many friends have asked about weaker powers. They are often discussed in the weak VIP technology group. So today we will understand the comparison of the three commonly used storage methods.
First, ip-san storage
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. It is only the connection between the server and the storage through the network switch. The performance is not very good, but it is not limited by the 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.
The IP-SAN storage mode has the following features:
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 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, support for backup and remote disaster recovery.
Second, CRV storage
Haikang 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. The unique data structure ensures 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.
CVR storage mode features
1, front-end direct writing unified management
Haikang CVR storage mode can support video streaming directly to the storage device through the encoder, eliminating the need for a storage server. Centralized management and status monitoring of multiple network storage devices can be realized through a centralized management platform; centralized configuration and management of storage devices in the service system can be realized, and the working status of the storage device unit and its corresponding manageable device components and running protocols can be monitored in real time. , RAID group and other content; centralized alarm management supports the periodic status inspection function of the storage device, real-time monitoring and centralized display of system running status, array operation, ISCSI, HTTP, CIFS, SCSI channel and other status.
2, simplify the network structure
The Haikang CVR storage mode is directly written into the storage device through the front-end encoding device, which does not require a storage server, simplifies the network structure, and liberates the network pressure problem between the storage server and the storage device in the original design.
3, unique streaming media file system protection technology
Haikang CVR storage mode uses the unique VSPP-video stream pre-protection technology to solve the problem of monitoring service stop, data read-only or loss caused by unstable file system or file system damage caused by power failure.
Haikang CVR storage mode adopts its own unique data block management structure and fault tolerance mechanism, which is free from the dependence on the server-side file system, avoids the impact of its file system damage on the monitoring business system, and provides a more stable and efficient management mode.
4, efficient disk fragmentation immune technology
The Haikang CVR storage model combines disk pre-allocation with delayed allocation technology to first find the free space area and use it to store new data, improving system performance and avoiding disk fragmentation. At the same time, combined with an efficient defragmentation program, the disk fragments are sorted when the system is idle, improving system performance.
Third, NVR storage
The NVR is an abbreviation for (ie, network hard disk recorder). The main 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.
Fourth, the application 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.
Dependence
CVR does not rely 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, and the connection between the front end and the storage is constantly trying to remount the connection. It is 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.