It is characterized by using optical fiber channel transmission rate high and the server network, SAN network connection, or internal components so that the whole storage network has a very wide bandwidth, provide a guarantee for the high performance data storage. In this SAN storage network, plays a key role is that we often hear the optical switch (Switch FC, also known as "fiber channel switch" and "SAN switch"). Because it belongs to a new type of equipment, and there is much difference and usually we see and use the Ethernet switch (mainly in protocol support), so many readers, even is already using the SAN storage network of enterprise users are on SAN switch a little knowledge. To this end, this article will be devoted to the SAN switch to buy things you need to pay attention to some of the issues to be introduced, in fact, is to introduce the main features of the SAN switch. First simple to understand the origin of SAN switches, so that we can deepen the understanding of SAN switches, no longer full of "mystery".