Use of multiple SAN protocols in Optical Fiber

The use of SAN multi-protocol is based on fiber channel. So what should I pay attention to when using some routes and switches for such optical fiber transmission? Next we will elaborate on this part. This great career of Kumar Malavalli originated from his comparison and Investigation of the world's popular network technologies represented by Ethernet and the channel technologies represented by SCSI ｡

He attempted to create an advanced network architecture based on the advantages of the network routing technology and the advantages of the channel technology. network technology, the advantages of the Channel Technology in addition to its shortcomings, with a variety of network technology background engineers are competing to understand the network, Channel Protocol to the fourth layer of the fiber channel (known as FC-4) at that time, the protocols that were standardized to the FC-4 were SCSI, IP, ATM, FICON (ESCON's fiber channel version) and so on. In the middle, the fiber-optic channel SCSI outshines. After 10 years of development, it has now evolved into a mainstream protocol for storing Local Area Network SAN multi-protocol and multi-protocol. FICON has also become a Mainframe) the mainstream of storage protocols, while the IP Technology Based on Fiber Channel has been applied in the management of fiber channel switches ｡

Fiber-channel-based SAN multi-protocol can transmit data at a high speed of 200 Mb/s. An important difference between fiber-channel and other network protocols is its data transmission bandwidth., in the Fiber Channel architecture, the bandwidth utilization can easily reach more than 99%. This is incomparable to other existing network protocols. Fiber Channel can extend the connection distance of SAN multi-protocol to 100 kilometers. above. If it is supplemented by protocol conversion technology (for example, from fiber channel to SONET conversion and from fiber channel to IP address conversion) the distance between multiple SAN protocols is more global. Fabric composed of fiber channel switches connected to each other can be connected to 239 fiber channel switches, device address space up to 24 bits. Compared with Ethernet, fiber channel data transmission in the same Fabric is device-to-device, data transmission in the same Ethernet Subnet is broadcast-type, which is the main reason why the bandwidth utilization of Fiber Channel is several times higher than that of Ethernet. the data in is transmitted by the device to the device, fiber Channel specifies a strict system to constitute a management system. In this system to constitute a management system, the access and removal of devices, including fiber channel switches, are carried out in the form of broadcast. the device is broadcast by a communication device ｡

The more fiber-channel switches in a Fabric, the larger the SAN multi-protocol network is formed. The more opportunities for Device Access and migration, resulting in more broadcast information for access and migration. although such broadcast information is insignificant than the data broadcast storm in Ethernet, however, the high availability level and network management required by the storage network cannot be ignored ｡

In various disaster tolerance systems, once the local and remote SAN multi-protocols are connected, a large Fabric is formed. However, long-distance bare optical fiber or IP connections that connect local and remote SAN multi-protocols are usually this is the weakest step in Fabric. in the context that local and remote SAN protocols belong to the same Fabric, if the connection between them is unstable, Fabric reconfiguration that affects the SAN multi-protocol architecture will occur. This is an important cause of instability of the disaster recovery system ｡

The Disaster Tolerance System is at a historical development stage from traditional disaster tolerance between two points to mutual disaster tolerance between multiple data centers and the provision of disaster tolerance as a service to multiple customers. the traditional isolated Fabric Structure of the channel is no longer able to adapt to multi-point disaster tolerance and to make disaster tolerance a service to the society. Today, there are already more than 100,000 SAN clusters in the world. protocol silos. Users often need to integrate these SAN multi-protocol silos. If such integration is integrated into a Fabric, the customer needs to adjust the Fiber Channel switch parameters, in many cases, the customer cannot even arrange enough scheduled downtime to complete system integration ｡

Different functional departments in the company objectively need to have the space and freedom for the development of their own department's storage network. The expansion of a department's SAN multi-protocol should not affect the storage network of other departments. all server memory is in the same Fabric, this is hard to achieve ｡