The server that is the master of the slave SAN is responsible for pumping data to tape libraries within the SAN, which devours bandwidth from that server. This bandwidth could be better used elsewhere. This is where serverless storage comes in. This router sends data directly to the actual storage devices in the SAN without any help from a server on the network.
Lets see how serverless storage works in as simple as terms possible.
SCSI's commands allowed storage devices to move data between one another only if they were in the same area. The extended copy command allows devices in different areas to transport data to each other. Software with this extended copy command is then coupled with a SAN component, which is usually a router or switch. The SAN component is then referred to as the copy manager and it assumes the role of transporting data from one device to another. Thus, the big boys of storage are getting into this attractive market fast.