San Implementation Essay

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SAN implementation over Gigabit Ethernet

A Storage Area Network is virtualized storage.

A storage area network (SAN) is a dedicated, centrally managed, secure information infrastructure, which enables any-to-any interconnection of servers and storage systems.
A SAN can be configured to provide a nearly infinite pool of storage that you can grow and move between servers as they need it. The storage can be added to and removed without requiring the server to be rebooted. The services provided by the server continue to operate without interruption.
The primary purpose for implementing a SAN is to provide a large storage pool that multiple hosts could access. Common storage configurations involve direct attachment of storage to a host.
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With a SAN, virtually unlimited expansion is possible with hubs and switches. Nodes can be removed or added with minimal disruption to the network.
What is Gigabit Ethernet.
Gigabit Ethernet supports 1000 Mbps over Ethernet media. Because it is similar to existing Ethernet and Fast Ethernet standards in that it uses the same frame format and collision detection mechanisms, Gigabit Ethernet is easy to integrate with existing Ethernet networks. It was designed as a Ethernet backbone switch-to-switch and switch-to-server technology.
To provide the speed increase from 100 Mbps Fast Ethernet up to 1 Gbps, several changes needed to be made to the physical interface of Gigabit Ethernet versus Fast Ethernet. It was decided that Gigabit Ethernet will look identical to FibreChannel at the physical layer. By taking advantage of the existing high-speed physical interface technology of FibreChannel while maintaining the IEEE 802.3 Ethernet frame format, backward compatibility for installed media, and use of full or half-duplex carrier sense multiple access collision detect (CSMA/CD), customers will be able to use their existing knowledge base to manage and maintain gigabit networks. They would not have to throw away their existing network infrastructure.
Gigabit Ethernet is intended for Fast Ethernet backbones and switch to server links where existing Ethernet networks are being aggregated onto the faster Gigabit Ethernet speeds. A company planning a
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