SAN circuitous route does not exist to solve the fiber infrastructure expansion
Most cases, storage networks and IP network technology is different. In the IP world, there are many routing protocols and standards; you have plenty of options. However, in the storage world, there is no formal routing protocols. Route does not exist, although it might not be as you imagine.
SAN is generally seen as a huge Layer2 (layer 2) network. Ethernet in the world using the spanning tree, while the SAN is used with a different mechanism to prevent the loop. Diffusion network, a major problem is the network a problem that may affect the entire network. In the SAN environment, because the nature of Fibre Channel protocol itself, this situation worse. Network architecture to solve this huge problem is to separate them into different networks.
IT world, we all know that island is not good, but a sound network design often need to use them. If too much of a SAN extension, fiber channel architecture in the establishment of more time to consider the stability of demand will account first. This does not mean you have established a standard of "bad" IT islands, but that you have two optical channels are established framework. The good news is that, when the two light channels in the framework of our exchange of information between, we can operate the same IP network.
In the IP network, we must have a unique IP address, but if it is not in the same subnet, then the network card address to repeat it does not matter. Fibre Channel is not Layer3 (layer 3) addresses, Layer2 address, or that its global name (WWN), must be unique. In SAN route, "route" transmission in two ways: the WWN convert, or Fibre Channel architecture virtual into another false WWN; or bogus addresses. WWN is due to be set carefully, so the only requirement WWN must not pose a problem, but it also really helps show the layers and nuances of the conversion.
Remember, SAN routing no agreement. We are here to discuss solutions from different vendors. Because different vendors to interoperate between the hard, so the efficiency of these mechanisms in the assessment of the time, to consider a different understanding and prejudices.
Fibre Channel routing architecture termination First SAN routing approach can be viewed as a proxy server, or is an extremely flexible proxy server. McData (now Brocade) developed a mechanism to connect multiple SAN islands. If you set reasonable, the switch can be initiated at the same time play the role of client and target side, essentially a proxy between the two Fibre Channel SAN connectivity architecture. When the termination of SAN switch ports, the administrator can still in many cases the same flexibility to set the logical unit number of visits, but their safety is not as high.
Do you remember the hard partitions and soft partitions article? If we need to ensure a degree of security to prevent malicious attacks and set the error caused harm, we tend to use port-based zoning approach , or hard partition. When setting up these islands to connect, transform, or map, you only option is set restrictions based on WWN. Although this is generally not a problem, but some things still need attention. Host bus adapter replacement process usually includes updates on the switches and storage arrays WWN mapping, and you also need to make sure "routing" configuration settings are aware of changes.
However, each island in the termination of SAN connectivity switch are still very favorable. Total probability of failure within the SAN was largely reduced, and the environment in the router the problem can be quickly separated. For the geographically dispersed network, SAN routing has been widely used to improve overall network reliability and stability.
Other routing
SAN routing technology can be used various other ways.
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