-based SAN Zoning"> Switch Zoning is the oldest and least innovative technique for SAN partitioning. Switch zoning narrows down the traffic running through a storage-networking device so that specific ports on the switch or hub can only see other specific ports. For example, on a 4-port switch with 2 servers and 2 RAID storage units attached to it, by creating 2 zones within the switch (one zone with Server A and RAID A and a second zone with Server B and RAID B) we can force a server to use one of the assigned storage units. As a result, while the physical topology of this example looks like a star (with the Fibre Channel switch in the center) since we enabled zoning, the logical representation seen by the components is 2 separate networks.
While zoning is a simple way to divvy up storage resources, it does not take advantage of all the abilities of a SAN, and it is inefficient. For example, if you were to invest in an expensive RAID unit with 2 ports, you would only be able to hook this RAID up to two servers, since the switch ports are dedicated to one device only.