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Fibre Channel Loop Switch - Arbitrated Loop

A Fibre Channel protocol used with arbitrated loop topology.  Fibre Channel interconnect topology in which all ports are connected in a common loop. Before transmitting data, an arbitrated loop port must participate in arbitration to gain control of the loop.

Based on the promise of significantly lower total cost of ownership when multiple servers share a centralized pool of storage, the industry is now preparing to broaden the application and scope of the SAN to include more complex implementations necessitating the addition of switching. As mainstream operating systems and storage devices support multi-server applications, these servers will require concurrent access to the shared storage resources. The switch provides this concurrency as well as necessary services such as "zoning" – or the ability to segment the network and bind each server to specific disk or tape storage resources. However, although the desire to introduce switching to SANs is quite clear, it is not without its challenges.

For small networks with multiple servers, a Loop Switch can immediately boost storage performance by allowing concurrent traffic between each server and the shared storage resources. Since the Loop Switch is based on the same protocol as the hub and other connected devices, the hub can literally be removed and replaced with a Loop Switch without any other changes to the network. 

This unique attribute of the Loop Switch drastically reduces the engineering effort and completely preserves the installed base of connected end-node devices. As the network grows, it’s easy to add another Loop Switch or hub to facilitate more servers or expanded storage capacity.
 

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Last modified: June 20, 2002